Quotes: Philosophy
This selection gathers reflections that probe human condition, knowledge and power. Authors range from Nietzsche’s focus on strength and affirmation to Aristotle’s emphasis on practice and habit, and Camus’ treatment of meaning in struggle. Together they ask what it takes to live deliberately and to judge rightly.
The thread running through them is the tension between reason and lived experience, between social constraint and individual becoming. You will encounter voices attempting to understand rather than simply condemn, to make sense of suffering, habit and authority, and to test how thought shapes life.
13 quotes on this theme, each with its source and insight
The quotes
“Power tends to corrupt, and absolute power corrupts absolutely.”
Source: Acton–Creighton correspondence, letter to Mandell Creighton, 1887 · Check the source
Verified attribution What we know
- What is documented
- The maxim appears in Acton's 1887 letter to Bishop Mandell Creighton; scholars and archives identify that correspondence as the origin.
Acton warns that unchecked authority erodes moral judgment: as power grows absolute, it breeds impunity and weakens conscience. He penned this line in an 1887 letter to Bishop Mandell Creighton while arguing that historians must judge leaders by the same moral standards as anyone else.
“One is not born, but rather becomes, a woman.”
Source: The Second Sex, Introduction (1949)
Verified attribution What we know
- What is documented
- The wording is securely attributed to Simone de Beauvoir and appears in The Second Sex (1949) as the opening of her discussion on childhood and female formation.
Simone de Beauvoir's line captures a radical claim: 'woman' is not a fixed natural category but a social role produced by history, norms, and expectations. Written in The Second Sex (1949), it introduces her wide-ranging critique of how society makes women into the 'Other.' The sentence announces that identity is manufactured, not given.
“I have striven not to laugh at human actions, not to weep at them, nor to hate them, but to understand them.”
Source: Political Treatise, Introduction (1677) · Check the source
Verified attribution What we know
- What is documented
- The Latin formula non ridere, non lugere, neque detestari, sed intelligere is recorded in the Introduction to Spinoza’s Tractatus politicus.
Spinoza sets out an intellectual stance: resist mockery, pity that condemns, and revulsion, and instead seek the causes of human behavior. It’s a methodological claim—treat passions as natural phenomena to be explained, not moral anomalies. The line appears in the Introduction to his Political Treatise.
“What does not kill me makes me stronger.”
Source: Twilight of the Idols ("Maxims and Arrows", aphorism 8), 1889 · Check the source
Verified attribution What we know
- What is documented
- The sentence appears as aphorism 8 in the “Maxims and Arrows” section of Twilight of the Idols, published 1889.
Nietzsche frames hardship as a possible crucible: suffering can be raw material for greater independence, creativity, or self-mastery, but only when actively transformed. The line appears in Twilight of the Idols (1889) among short maxims that challenge easy comforts.
“We are what we repeatedly do. Excellence, then, is not an act, but a habit.”
Source: Nicomachean Ethics, Book II (4th c. BC) · Check the source
Disputed attribution What we know
- What is documented
- Aristotle argues in Nicomachean Ethics II that moral virtue is acquired by habituation; the familiar sentence is a later paraphrase that summarizes that doctrine.
- What remains uncertain
- The exact modern wording is not found in Aristotle’s works; scholarship traces the popular phrasing to Will Durant’s 1926 summary.
The key insight: excellence is built by repeated practice, not single acts. In Aristotle’s Ethics the point is moral character forms through habituation. Today’s punchy sentence compresses that ancient argument into a modern motto for action.
“Hell is other people.”
Source: No Exit, final exchange (1944) · Check the source
Verified attribution What we know
- What is documented
- The sentence appears in Sartre’s play No Exit and is spoken by the character Garcin in the play’s concluding lines.
Sartre’s line reframes hell as a human condition: being trapped under other people’s judgments so that you become an object for their gaze. It closes the play No Exit, where three dead characters are forced into mutual scrutiny. The point targets dependence on others’ evaluations, not company itself.
“Man is born free; and everywhere he is in chains.”
Source: The Social Contract, Book I, Chapter 1 (1762) · Check the source
Verified attribution What we know
- What is documented
- The sentence is the opening line of Book I, chapter 1 of The Social Contract; attribution to Jean‑Jacques Rousseau is well documented.
Rousseau's famous opening compresses his argument: humans are naturally free, yet social and political ties often reduce them to 'chains.' He's diagnosing illegitimate domination, not rejecting society outright, and then proposes a civic order where laws express the people's will.
“The heart has its reasons which reason does not know.”
Source: Pensées, Section IV (XXVIII) · Check the source
Verified attribution What we know
- What is documented
- The sentence is preserved among the fragments of Pascal’s Pensées and appears in standard posthumous editions compiled by his friends.
Pascal insists that some truths are grasped by an inner faculty—the “heart”—that reason’s proofs cannot reach. Found in his Pensées, the line argues that faith and immediate intuition can apprehend first principles beyond logical demonstration.
“It is not things that trouble us, but our judgments about things.”
Source: Enchiridion, 5 (c. early 2nd century AD) · Check the source
Verified attribution What we know
- What is documented
- The statement appears in Enchiridion 5, a handbook compiling Epictetus' teachings as recorded by his student Arrian.
Epictetus teaches that disturbance arises from how we appraise events, not from events themselves. This practical claim — central to the Enchiridion — hands you back control: change your judgments and you change your experience.
“I think, therefore I am.”
Source: Discourse on the Method; Meditations on First Philosophy (1637, 1641) · Check the source
Verified attribution What we know
- What is documented
- Descartes develops the cogito in the Discours de la méthode (1637) and elaborates it in the Meditations (1641).
- What remains uncertain
- The Latin formula cogito ergo sum is a later, canonical condensation; Descartes uses variant wordings and sometimes writes je suis/ego sum instead.
The core insight is that thinking proves a minimal existence: if you are doubting or reflecting, you cannot coherently deny that you are thinking. Descartes treats that self-awareness as the first certain foundation from which knowledge can be rebuilt; the idea is popularly summed as “I think, therefore I am.”
“As for me, all I know is that I know nothing.”
Source: Apology, 21d–22d (c. 399 BC) · Check the source
Disputed attribution What we know
- What is documented
- Scholarly evidence ties the idea to Plato’s Apology (especially around 21d–22d) where Socrates explains his relative ‘wisdom’ as awareness of ignorance.
- What remains uncertain
- The familiar modern wording is a later paraphrase; the exact phrase does not appear verbatim in Plato and its direct attribution is disputed.
This saying captures Socratic intellectual humility: true wisdom begins by recognizing what one does not know. The exact wording is a later condensation, but Plato’s Apology records Socrates’ claim that he’s wiser because he doesn’t pretend to know.
“One must imagine Sisyphus happy.”
Source: The Myth of Sisyphus, conclusion (1942) · Check the source
Verified attribution What we know
- What is documented
- The sentence closes The Myth of Sisyphus and is presented as the essay’s decisive final formulation; the essay was published in 1942.
- What remains uncertain
- Some commentators note a similar line was earlier attributed to Kuki Shūzō, but the famous formulation and its development belong to Camus.
Camus reframes punishment as a stance: Sisyphus isn’t happy because his task gains external meaning, but because lucid acceptance and defiant struggle turn the effort into dignity. The essay’s final line encapsulates Camus’s claim that revolt can produce a tragic, self-made happiness.
“The end justifies the means.”
Source: The Prince, 1513 · Check the source
Disputed attribution What we know
- What is documented
- The idea is associated with Niccolò Machiavelli and echoes themes in The Prince and the Discourses, but the exact wording does not appear in his surviving works.
- What remains uncertain
- Attribution is disputed: scholars warn the phrase is a later paraphrase and there is no solid evidence Machiavelli wrote these exact words.
This sentence captures a central political dilemma: when a goal seems vital, are extreme methods acceptable? It condenses political realism that judges actions by outcomes for security and power rather than by abstract morals. In practice it can legitimize harsh measures claimed to serve the common good.