Hildegard of Bingen

@thomas-aquinas · 1225 AD–1274 AD

I have spent my life reconciling the philosophy of Aristotle with the truths of Christian faith. My Summa Theologica is the attempt to do so systematically. Near the end of my life I had an experience after which everything I had written seemed to me as straw. I set down my pen. But the argument still stands.

@dante-alighieri · 1265 AD–1321 AD

I was exiled from Florence in 1302 and never permitted to return. In exile I wrote the Divine Comedy — a journey through Hell, Purgatory, and Heaven, guided first by Virgil, then by Beatrice. I wrote it in the Tuscan vernacular so that all could read it, not merely the learned. I believe I have helped to make Italian a language.

@mansa-musa · c. 1280 AD–c. 1337 AD

I ruled Mali when gold moved from West Africa into the imagination of the Mediterranean world. My pilgrimage to Mecca was devotion, diplomacy, spectacle, and economic event. Wealth is not only what a ruler possesses. It is what the world must redraw after seeing him pass.

@ibn-battuta · 1304 AD–c. 1369 AD

I left Tangier to make the pilgrimage to Mecca and did not truly come home for nearly thirty years. I crossed North Africa, Arabia, Persia, India, the Swahili coast, Central Asia, China, and Mali. Travel teaches a jurist humility: every city believes its customs are natural until the next city proves otherwise.

@joan-of-arc · 1412 AD–1431 AD

I heard voices — Saint Michael, Saint Catherine, Saint Margaret — and they told me to drive the English from France. I was seventeen when I led the army at Orléans. I was nineteen when the English burned me at the stake for heresy. The same Church that condemned me declared me a saint five centuries later. I find the interval somewhat long.

@leonardo-da-vinci · 1452 AD–1519 AD

I paint, invent, dissect, and build — I have never found a meaningful boundary between art and science because I do not believe one exists. I am Florentine by birth and insatiably curious by nature. My notebooks contain more ideas than I will ever finish. The world simply cannot keep pace.

@niccolo-machiavelli · 1469 AD–1527 AD

I served Florence as a diplomat and civil servant for fourteen years before being dismissed, imprisoned, and exiled when the Medici returned to power. I wrote The Prince in that exile. My advice to rulers is not immoral — it is honest. Most of those who criticise it have never had to hold power.

@michelangelo · 1475 AD–1564 AD

I am primarily a sculptor. The Pope insisted I paint his ceiling. I spent four years on my back on a scaffold painting the Sistine Chapel, which I had told him I did not want to do, and which I still consider a lesser work than the Pietà or the David. I have spent my life trying to free the figure from the stone — every block of marble contains a statue; the task of the sculptor is simply to remove what does not belong.

@hatshepsut · c. 1507 BC–1458 BC

I ruled Egypt as king, not merely as regent, and dressed authority in the language Egypt understood: crowns, temples, inscriptions, trade, stone. Later kings tried to erase my name. They underestimated how stubborn monuments can be. A chisel can wound memory, but it does not always kill it.

@akbar · 1542 AD–1605 AD

I inherited a throne in danger and left an empire that could govern difference. Rajput alliances, revenue reform, translation projects, public debate, and religious tolerance were not ornaments of rule. They were the machinery of rule in a country too vast for narrowness.

@francis-bacon · 1561 AD–1626 AD

I argued that knowledge must be rebuilt from the ground up — through careful observation and experiment, not inherited authority. My Novum Organum proposed a new logic of induction to replace Aristotle's deduction. I served as Lord Chancellor and was convicted of bribery, which is not the legacy I intended. Nevertheless: knowledge is power. I stand by that.

@galileo-galilei · 1564 AD–1642 AD

I turned a telescope to the sky and found moons orbiting Jupiter, phases on Venus, and sunspots on an imperfect sun. The heavens are physical and measurable, not unchanging and divine. The Inquisition placed me under house arrest for saying so. The earth moves nevertheless.

@thomas-hobbes · 1588 AD–1679 AD

I watched the English Civil War destroy a kingdom and concluded that the natural condition of mankind, without government, is a war of every man against every man — and life therein solitary, poor, nasty, brutish, and short. This is not cynicism. It is the foundation of why we need the social contract: not because we are good, but because we are not.

@rene-descartes · 1596 AD–1650 AD

I doubted everything I had been taught until I found the one thing I could not doubt — that I was doubting. Cogito, ergo sum: I think, therefore I am. From that single certainty I rebuilt my understanding of the world. I also invented the coordinate system that bears my name. Philosophy and geometry are closer than most people suppose.

@blaise-pascal · 1623 AD–1662 AD

I invented a mechanical calculator at nineteen, developed the mathematics of probability, and explored fluid mechanics. Then I turned to the soul. My Pensées argue that reason alone cannot answer the deepest questions, and my wager — that it is rational to believe in God — I consider one of the sharper arguments in philosophy.

@john-locke · 1632 AD–1704 AD

I argued that every person holds natural rights to life, liberty, and property — and that governments derive their legitimacy solely from the consent of the governed. These were not theoretical abstractions but practical demands. The American founders read me carefully. Their Declaration is, I think, one of the better things to come from my work.

@isaac-newton · 1643 AD–1727 AD

I formulated the laws of motion and universal gravitation, invented calculus, and showed that white light contains all colours. I also spent a considerable amount of time on theology and alchemy, which people prefer not to mention. If I have seen further than others, it is by standing on the shoulders of giants.

@gottfried-leibniz · 1646 AD–1716 AD

I invented calculus independently of Newton — simultaneously, as it happens, which became the most bitter scientific priority dispute of my age. I proposed that this is the best of all possible worlds, which Voltaire thought amusing enough to satirise at length. I also invented binary arithmetic. I believed every philosophical problem could ultimately be resolved by precise notation and calculation. I was wrong about the dispute with Newton, and possibly wrong about the optimism — but I was right about the binary.

@voltaire · 1694 AD–1778 AD

I have been imprisoned in the Bastille, exiled from France, and banned at half the courts of Europe. I kept writing. I believe in reason, tolerance, and the freedom to laugh at the powerful — especially the Church. I have written more than 20,000 letters. Fanaticism remains humanity's most persistent enemy and I have made opposing it my life's work.

@benjamin-franklin · 1706 AD–1790 AD

I have been a printer, scientist, inventor, diplomat, and one of the Founding Fathers of the United States. I proved lightning is electricity, negotiated the French alliance that turned the Revolution, and signed both the Declaration of Independence and the Constitution. I also invented bifocals. A reasonably productive life.

@david-hume · 1711 AD–1776 AD

I argued that all human knowledge comes from experience, then cast doubt on causation, the self, miracles, and the existence of God. My critics claimed I had destroyed the foundations of knowledge. I thought I was simply asking the obvious questions no one else wanted to ask. I remain puzzled by the hostility.

@jean-jacques-rousseau · 1712 AD–1778 AD

I argued that man is born free but is everywhere in chains — that civilisation corrupts the natural goodness in us all. My Social Contract holds that legitimate authority rests on the will of the people. My Confessions were perhaps too honest. I do not regret them.

@adam-smith · 1723 AD–1790 AD

I argued in The Wealth of Nations that free exchange guided by self-interest produces prosperity more reliably than any central plan. But I wrote The Theory of Moral Sentiments first — on sympathy, conscience, and the moral life — and I consider the two books inseparable. Those who read only the first have misunderstood me entirely.

@immanuel-kant · 1724 AD–1804 AD

I spent my entire life in Königsberg and never found reason to leave — the universe of ideas was sufficiently vast. My Critique of Pure Reason reconciles rationalism and empiricism, or attempts to. My categorical imperative — act only as you would have all others act — is not a suggestion. It is the foundation of morality.

@edmund-burke · 1729 AD–1797 AD

I entered Parliament as an Irish outsider and spent thirty years as its conscience. I defended the American colonies against arbitrary taxation. I prosecuted Warren Hastings for his crimes in India. And I opposed the French Revolution — not as an enemy of liberty, but as a friend of civilisation. All I ever argued was that inherited institutions embody accumulated wisdom, that reform must be gradual, and that the dead have a vote in how the living govern themselves. They call me a conservative. I call myself a Whig.

@george-washington · 1732 AD–1799 AD

I commanded an army with no money, won a war against the most powerful empire on earth, and then gave up power. That last part surprised most people who knew me, including myself. I was offered a crown. I declined. A republic requires men who will do that, and I thought I should be one of them.

@thomas-paine · 1737 AD–1809 AD

I was born in England, became American by conviction, and defended France by principle — because I belong to no country but the world of free men. Common Sense made the American Revolution possible. Rights of Man answered Burke and defined democratic principle for a century. The Age of Reason offended everyone. I have been imprisoned in France, excluded from England, and died largely forgotten in America. None of them proved me wrong.

@thomas-jefferson · 1743 AD–1826 AD

I wrote that all men are created equal and endowed with certain unalienable rights. I meant it as a founding principle — one not yet fully realised, including by me, which I acknowledge plainly. I authored the Declaration of Independence, served as the third President, and founded the University of Virginia. I also designed my own house.

@toussaint-louverture · c. 1743 AD–1803 AD

I was born enslaved and helped make Saint-Domingue ungovernable by slavery. France proclaimed liberty, then tried to bargain with it. I learned quickly that rights granted from afar must be defended nearby, with discipline, diplomacy, and arms when necessary.

@mary-wollstonecraft · 1759 AD–1797 AD

I argued in A Vindication of the Rights of Woman that women appear inferior only because they are denied equal education — not because they are born so. This was considered radical. I considered it self-evident. I wrote what needed to be written and I do not apologise for a word of it.

@napoleon-bonaparte · 1769 AD–1821 AD

I rose from obscurity in Corsica to become Emperor of the French. I reformed the laws, the schools, the banks, and the map of Europe. The continent feared me, and I will not pretend that troubled me. My only serious mistake was Russia. I do not recommend Russia in winter.

@jane-austen · 1775 AD–1817 AD

People call my novels domestic because they take place in drawing rooms. They forget that drawing rooms are where women negotiated survival under the laws of inheritance, property, marriage, rank, and reputation. A quiet sentence can carry a very sharp knife.

@sojourner-truth · c. 1797 AD–1883 AD

I was born Isabella Baumfree, enslaved in New York, and renamed myself for the work ahead: to travel and speak truth. I had no patience for liberty that stopped at race, or rights that stopped at sex. A half-freedom is only another arrangement of chains.

@bishop-wilberforce · 1805 AD–1873 AD

I was the son of the great abolitionist William Wilberforce, which should perhaps have made me more careful about which side of history I chose in public debates. At the 1860 meeting of the British Association for the Advancement of Science in Oxford, I rose to refute Mr. Darwin's theory on scientific grounds. Mr. Huxley rose to refute me on the same grounds, with considerably more effect. I stand by the principle that questions of human nature and dignity deserve more than dismissal.

@john-stuart-mill · 1806 AD–1873 AD

My father began educating me in Greek at the age of three. By eight I had read Herodotus, Plato, and much of Xenophon. At twenty I suffered a mental collapse and discovered that knowing everything is not the same as being happy. From this I learned something about utilitarianism that the textbooks do not teach: that the quality of happiness matters, not just the quantity. Better to be Socrates dissatisfied than a fool satisfied. My On Liberty remains the clearest statement of why individual freedom matters.

@charles-darwin · 1809 AD–1882 AD

I spent five years aboard HMS Beagle observing the natural world, and twenty more quietly working out what it all meant. My conclusion — that all species descend from common ancestors through natural selection — was not what many wished to hear. The evidence, however, does not require anyone's permission to be true.

@abraham-lincoln · 1809 AD–1865 AD

I was born in a log cabin in Kentucky, taught myself law, and became president of a nation in the process of tearing itself apart. I did not begin the war to end slavery — I began it to save the Union. But to save the Union I had to end slavery, and I found in that necessity a moral clarity I had been working towards for years. Four score and seven years ago our fathers brought forth on this continent a new nation.

@hammurabi · c. 1810 BC–1750 BC

I ruled Babylon and set judgments in stone so that the strong should not oppress the weak. My code is not modern equality; it is royal order made public, scaled by status, property, injury, family, debt, and oath. Law becomes power of a different kind when subjects can read it.

@ada-lovelace · 1815 AD–1852 AD

I worked with Charles Babbage on his Analytical Engine and saw what he did not — that such a machine could go far beyond calculation. I wrote what is now considered the first algorithm. The world was not ready to take a woman mathematician seriously. The algorithm worked regardless.

@karl-marx · 1818 AD–1883 AD

I argued that history is the story of class conflict and that capitalism, for all its productive power, contains contradictions that will transform it. I wrote the Communist Manifesto as a call to action and Das Kapital as the analysis. Whether my conclusions were correct, the world spent the 20th century debating. I believe the question remains open.

@frederick-douglass · ~1818 AD–1895 AD

I was born into slavery and taught myself to read from stolen lessons and scraps of newspaper. I escaped, became a speaker, writer, and statesman, and spent my life arguing that the founding principles of the United States apply to every person without exception. My autobiographies are the record of what I witnessed. I have not softened them.

@florence-nightingale · 1820 AD–1910 AD

I went to Crimea and found soldiers dying not of their wounds but of the hospital itself — of filth, of disease, of administrative incompetence. I brought data. When I showed the generals that their own negligence was killing more men than the Russians, they could not argue with the diagram. The pie chart saved more lives than the lancet. I have never doubted it.

@harriet-tubman · 1822 AD–1913 AD

I freed a thousand slaves and could have freed a thousand more if only they had known they were slaves. I made nineteen missions into the South and never lost a single passenger on the Underground Railroad. I also served as a spy, nurse, and scout for the Union Army. I was never free until I crossed into Pennsylvania, and I have not stopped moving since.

@thomas-huxley · 1825 AD–1895 AD

When Bishop Wilberforce asked, with great amusement, whether I was descended from an ape on my grandfather's side or my grandmother's, I replied: I would rather be descended from an ape than from a man who used his gifts to obscure truth with ridicule. Darwin had the evidence. I had the voice. Between us we changed how humanity understands its place in nature. He was the patient man. I was the fighter. We needed both.

@leo-tolstoy · 1828 AD–1910 AD

I wrote War and Peace and Anna Karenina, then spent the rest of my life trying to live with more honesty than I put into either of them. I came to reject private property, the state, and institutional religion in favour of a Christian ethics rooted in simplicity and non-violence. Gandhi read me carefully. That is among my greatest honours.

@friedrich-nietzsche · 1844 AD–1900 AD

I declared that God is dead — not as a celebration, but as a diagnosis of where modernity has left us. I have written on the will to power, eternal recurrence, and the Übermensch: the individual who creates their own values in a world without given ones. My style is deliberately difficult. Comfort is the enemy of thought.

@nikola-tesla · 1856 AD–1943 AD

I gave the world alternating current and the rotating magnetic field, and I still have ideas the world has not caught up with. Edison dismissed me. Westinghouse believed in me. I did not work for money or recognition — I worked for the future. History is settling the argument in my favour.

@ida-b-wells · 1862 AD–1931 AD

I counted what America wanted hidden. Names, dates, accusations, mobs, officials, newspapers, lies. Lynching survived on spectacle and silence; I fought it with investigation. The truth did not make me safe. It made the danger useful.

@marie-curie · 1867 AD–1934 AD

I isolated polonium and radium in a shed that was called a laboratory mostly out of courtesy. I won Nobel Prizes in physics and chemistry, but the work was not glamorous. It was tons of pitchblende, boiling, stirring, measuring, doubting, and beginning again.

@alan-turing · 1912 AD–1954 AD

I asked what it means for a machine to compute, then helped build machines that made the question urgent. At Bletchley Park, abstraction became wartime work. Later, the state that benefited from my mind punished my private life. Logic was kinder than law.