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Ideas & Philosophy

1,874 cards. Each one is a 40-second story with a five-minute read behind it. Page 20 of 32.

1141. A fallacious argument can still land on a true conclusionFaulty reasoning does not guarantee a false answer. Affirming the consequent is a textbook error, yet it can stumble onto the truth by accident. What makes an argument fallacious …
1142. You cannot change the past or the laws of nature, so are your choices yours?In the 1960s Carl Ginet sharpened an old worry into a crisp argument. If determinism holds, your present state follows from the distant past plus the laws of nature, and you contr…
1143. Allow one contradiction into classical logic and you can prove absolutely anythingLogicians call it the principle of explosion: once a set of axioms contains a contradiction, every proposition becomes provable. Latin gives it a cheeky name, ex falso quodlibet, …
1144. The phrase critical thinking first surfaced in an 1815 literary journalAccording to the Oxford English Dictionary, the exact words appeared in The Critical Review in 1815, describing literary analysis. Within a century they had come to mean a general…
1145. A perfectly valid argument can prove that no cats are frogs using false premisesDeduction cares about form, not truth. Say every frog is a mammal and no cat is a mammal, and it follows flawlessly that no cat is a frog. The reasoning is valid even though a pre…
1146. Laplace imagined a mind that could read the entire future from particle positionsPicture an observer who knows the exact position and velocity of every particle in the universe. Pierre-Simon Laplace argued such a being could calculate everything still to come.…
1147. Bentham and Mill never held a philosophy job; today almost every philosopher doesMany of the nineteenth century's great thinkers were journalists, politicians, clergy or civil servants. Then philosophy turned into a profession with doctorates, departments and …
1148. Vyasa wrote the Mahabharata and fathered both sides of its warHindu tradition credits the sage Vyasa with composing the Mahabharata, splitting the one Veda into four and writing the eighteen major Puranas. He is also a character inside his o…
1149. Zhiyi built Chinese Buddhism's first great home-grown system of thoughtOrphaned by war at seventeen and a monk by eighteen, Zhiyi went on to found the Tiantai school, which spread to Korea, Japan and Vietnam. The scholar David Chappell ranks him besi…
1150. Zoroaster's name probably means something like 'he who manages camels'The prophet behind one of the world's oldest surviving faiths may have been named for handling camels. Nobody even agrees when he lived: estimates stretch across a thousand years,…
1151. The Buddha told his students to scrutinise him like a suspectBuddhist philosophy did not ask for blind faith. Early texts describe followers weighing the teachings with wisdom before accepting them, and one discourse has the Buddha inviting…
1152. Physics says a butterfly triggers a tornado but does not cause itIn physics, a cause must sit inside the past light cone of its effect, reachable by a signal no faster than light. Break that rule and some observers would see messages arrive bef…
1153. A politically shattered China produced a Hundred Schools of ThoughtBetween about 770 and 221 BCE, rival Chinese states fought constantly, and that turmoil bred an astonishing burst of ideas. Confucius, Laozi, Mozi and Han Fei offered competing an…
1154. Is Christian philosophy original thought or Greek ideas in new clothes?Early Christians disagreed sharply about reason. Origen and Augustine saw faith and science in harmony; Tertullian saw a clash. Out of that argument grew a tradition spanning more…
1155. Common sense started life as Aristotle's name for a sixth senseFor Aristotle, the 'common sense' was an inner faculty that fused sight, sound and smell into perception of one real thing. Romans turned it into tact and community feeling. Only …
1156. Boathouse or houseboat: how your mind snaps simple ideas togetherPut 'boat' and 'house' together one way and you get a shed for boats; flip them and you get a floating home. Concepts are the building blocks behind that trick. They let you recog…
1157. Socrates heard an inner voice that only ever told him noSocrates claimed a divine sign warned him whenever he was about to make a mistake, but never urged him toward anything. That image of a restraining inner voice is one of many ways…
1158. The world's first outcome-based ethics came from China, not Victorian EnglandLong before Jeremy Bentham tallied pleasure against pain, the Chinese thinker Mozi judged actions by whether they benefited everyone under heaven. The Stanford Encyclopedia of Phi…
1159. Can you know something is true without ever checking the world?Nobody needs a weather report to know that London is either sunny or not sunny today. Whether it actually is sunny, though, requires looking outside. That small gap between knowin…
1160. Every word you know began as an act of throwing detail awayCalling a scuffed leather football simply a ball means ignoring nearly everything about it. That deliberate forgetting is abstraction, and researchers think humans began doing it …
1161. The Morning Star and the Evening Star launched a whole philosophical movementBoth names point at Venus, yet saying one equals the other tells you something, while saying the Morning Star is the Morning Star tells you nothing. Gottlob Frege's 1892 puzzle ab…
1162. A perfectly valid argument can still prove that bats are birdsBats fly, and every flying creature is a bird, so bats are birds. The conclusion is false, yet logicians call the argument valid, because if both premises were true the conclusion…
1163. Is beauty in the object, the beholder, or a jury of experts?Weighing a grapefruit is objective; liking its taste is personal. Calling it beautiful sits awkwardly between the two, grounded in feeling yet claiming everyone should agree. Phil…
1164. Ramanuja challenged Shankara and opened temple worship to castes long kept outsideTradition says Ramanuja lived for 120 years; historians prefer roughly 1077 to 1157. Either way, this Tamil philosopher broke with his teacher, argued that liberation comes throug…
1165. One short verse about causes turned a wandering sceptic into the Buddha's wisest discipleUpatissa had tried a sceptic teacher and walked away unsatisfied. Then a calm monk recited four lines saying everything arises from causes and ceases when they cease. That stanza,…
1166. Sri Aurobindo deliberately flunked a riding test to escape the British civil serviceRaised in England from the age of seven, Aurobindo Ghosh placed 11th of 250 in the Indian Civil Service exam, then skipped the horse-riding test on purpose. Back in India he becam…
1167. A sceptical Calcutta student who mocked his guru's visions later electrified ChicagoNarendranath Datta read Hume, Kant and Spencer, asked every notable in Calcutta whether they had seen God, and dismissed Ramakrishna's trances as hallucinations. A decade later, a…
1168. No writing survives from the Buddha's lifetime; the first comes from an emperor's pillarSiddhartha Gautama founded one of the world's great religions, yet nothing was written about him for one or two centuries after he died. The earliest firm trace is Emperor Ashoka'…
1169. Henry VIII's archbishop secretly married a Lutheran's niece while still a Catholic priestThomas Cranmer was a little-known Cambridge don when the Boleyn family helped make him Archbishop of Canterbury. Within months he annulled Henry VIII's first marriage and crowned …
1170. Legend says Sanskrit poetry began when Valmiki cursed a hunter who shot a craneHindu tradition hails Valmiki as the first poet. The story goes that grief at watching a hunter kill one of a pair of cranes forced a couplet out of him, the first shloka, and he …
1171. Vasubandhu wrote the standard textbook of one Buddhist school, then critiqued it in his own notesVasubandhu condensed the orthodox Sarvastivada system into a set of verses, then added a commentary that often picks those verses apart. Later, persuaded by his half-brother Asang…
1172. Tibetans call him the second Buddha, yet almost nothing about Nagarjuna's life is certainNagarjuna's verses on emptiness steered Indian thought for a thousand years and still anchor Mahayana Buddhism from Tibet to Japan. His biography, though, is a thicket of legends:…
1173. The Buddha's cousin and attendant whose memory reportedly preserved most of the sermonsAnanda served the Buddha for 25 years, fetching water, guarding his door at night and once stepping in front of a rampaging elephant. After his teacher died, tradition says he rec…
1174. Tibet's Lotus-Born guru was hired, in the oldest telling, to subdue angry local godsWhen floods and lightning convinced Tibet's court that local spirits opposed Buddhism, a tantric adept from Oddiyana was called in to tame them. Padmasambhava cleared the way for …
1175. Steve Jobs ordered 500 copies of this guru's autobiography for his own memorialParamahansa Yogananda sailed to Boston in 1920 as a delegate to a religious congress and stayed for three decades. He dined at Coolidge's White House, packed lecture halls, drew F…
1176. Patanjali of the Yoga Sutras was probably not the famous grammarian of the same nameTradition praises one sage Patanjali for purifying the mind with yoga, speech with grammar and the body with medicine. Most modern scholars see at least two or three different men…
1177. Luther's Greek professor wrote the Reformation's defining confession, and Luther disliked its tonePhilipp Melanchthon arrived at Wittenberg at 21 to teach Greek and became the Reformation's first systematic theologian. He drafted the Augsburg Confession of 1530 while Luther wa…
1178. A village boy who hated arithmetic became the Bengali mystic behind the Ramakrishna OrderRamakrishna left school at fourteen, spoke rustic Bengali and never mastered sums. Yet as a priest at a Calcutta Kali temple he tried Tantric, Vedantic, Christian and Sufi practic…
1179. A 16-year-old's sudden fear of dying became Ramana Maharshi's lifelong question: who am I?In July 1896 a Madurai schoolboy lay rigid, gripped by the sense that he was about to die, and asked himself what exactly would perish. Six weeks later he slipped away by train to…
1180. The grandson of a convert whose hadith book Sunnis rank just below the QuranBorn in Bukhara in 810 and orphaned of his father as a baby, Muhammad al-Bukhari reportedly held more than 600,000 narrations in memory. From them he distilled about 7,563 into a …
1181. An 18th-century Najdi preacher whose alliance with the Saud family still shapes ArabiaMuhammad ibn Abd al-Wahhab was chased out of Basra for preaching against shrine veneration. Back in central Arabia he struck a pact with Muhammad bin Saud, and the power-sharing d…
1182. A Safavid philosopher argued existence comes before essence, centuries before Paris cafés didIn 17th-century Shiraz, Mulla Sadra claimed that things must first exist before they can have any nature at all. Condemned by some clerics and forced into rural retreat, he return…
1183. Imam Muslim's hadith book overlaps with al-Bukhari's by thousands of reportsMuslim ibn al-Hajjaj of Nishapur befriended al-Bukhari and built a rival collection of sound hadith. Early critics grumbled that he left out too much and trusted weak narrators, y…
1184. A Hindu champion of the Vedas who argued there is no creator GodKumārila Bhaṭṭa fought hard for the supreme authority of Vedic scripture against Buddhist rivals. Yet the same seventh-century thinker rejected the idea of a supreme deity, reason…
1185. Madhvacharya left an Advaita monastery to argue soul and God are forever distinctTrained in a monastery that taught the soul and God are ultimately one, the young monk Madhva kept arguing with his guru until he walked out. The dualist Dvaita school he founded …
1186. Nobody agrees when Mahavira lived, give or take a centuryJains honour Mahavira as the twenty-fourth and last ford-maker of our cosmic age, a prince who gave everything away at about thirty. Tradition dates his birth to 599 BCE, but hist…
1187. The Imam of Medina wrote one of Islam's oldest surviving law booksMalik ibn Anas hardly needed to travel: the learning of early Islam came to him in Medina. His Muwatta is among the earliest Muslim legal texts still in existence, the chain of tr…
1188. A thunderstorm sent Martin Luther into a monastery instead of law schoolIn July 1505 a lightning bolt struck near a young law student riding back to Erfurt. Terrified of death and judgement, Martin Luther became a friar. Twelve years later his Ninety-…
1189. Christian Science grew out of a New England mesmerist's treatment roomMary Baker Eddy spent decades in poor health, lost a husband, her mother and a fiancé within a few years, and gave up her son. After sessions with the mesmerist Phineas Quimby and…
1190. The Buddha's second chief disciple was converted by a verse he heard secondhandTwo boyhood friends made a pact: whoever found the truth first would tell the other. One met a monk who summed up the Buddha's teaching in a single stanza about causes, and passed…
1191. Methodism's founder was plucked from a burning rectory at age fiveIn February 1709 a five-year-old boy was stranded upstairs as his family's rectory burned, until a parishioner standing on another man's shoulders pulled him through a window. Joh…
1192. America's fire-and-brimstone preacher wrote a childhood essay on ballooning spidersJonathan Edwards is remembered for Sinners in the Hands of an Angry God. The same mind entered Yale before turning 13, devoured Locke and Newton, studied light and optics, and at …
1193. Joseph Smith published the Book of Mormon at 24 and was dead by 38A Vermont farm boy who once hunted buried treasure with a seer stone went on to publish the Book of Mormon in 1830. Within fourteen years Joseph Smith had tens of thousands of fol…
1194. Kūkai expected twenty years of study in China and mastered it in monthsIn 804 a little-known Japanese monk sailed for Tang China hoping someone could explain a baffling Sanskrit scripture. Within months of meeting the master Huiguo he received the hi…
1195. Kapila founded a school of Indian philosophy, but which Kapila?Hindu tradition honours Kapila as the sage who founded Samkhya, one of India's oldest philosophical systems, sometime before the Buddha. Yet the name crops up across so many texts…
1196. The theologian who refused Hitler's oath ended up on the cover of TimeIn 1935 only two professors at Bonn refused to swear loyalty to Hitler, and Karl Barth was one of them. The Swiss pastor had already drafted almost all of the Barmen Declaration a…
1197. Khadija hired Muhammad, then proposed to him, then became Islam's first believerKhadija bint Khuwaylid ran a trading business so large that her caravan was said to match those of every other Quraysh merchant combined. She hired a young Muhammad to take goods …
1198. Two armies were sent to fetch one monk, and China's Buddhism changedKumārajīva was so famous that a Chinese emperor dispatched an army to conquer his homeland and bring him back, and a later ruler sent another to free him from the warlords holding…
1199. The Shia imam whose classroom trained two founders of Sunni lawJa'far al-Sadiq barely left Medina, refused every rebel who begged for his backing, and set fire to one recruiting letter. Yet around four thousand scholars reportedly sat at his …
1200. The five points of Calvinism were written as a reply to one DutchmanJacobus Arminius trained under Calvin's own successor in Geneva, then spent his career quietly questioning the harshest reading of predestination. He died in 1609, but his ideas s…

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