- "The unexamined life is not worth living" - Socrates
- "Whereof one cannot speak, thereof one must be silent" - Ludwig Wittgenstein
- "Entities should not be multiplied unnecessarily" - William of Ockham
- "The life of man (in a state of nature) is solitary, poor, nasty, brutish, and short" - Thomas Hobbes
- "I think therefore I am" ("Cogito, ergo sum") - René Descartes
- "He who thinks great thoughts, often makes great errors" - Martin Heidegger
- "We live in the best of all possible worlds" - Gottfried Wilhelm Leibniz
- "What is rational is actual and what is actual is rational" - G. W. F. Hegel
- "God is dead! He remains dead! And we have killed him." - Friedrich Nietzsche
- "There is but one truly serious philosophical problem, and that is suicide" - Albert Camus
- "One cannot step twice in the same river" - Heraclitus
- "The greatest happiness of the greatest number is the foundation of morals and legislation" - Jeremy Bentham
- "To be is to be perceived" ("Esse est percipi")- Bishop George Berkeley
- "Happiness is not an ideal of reason but of imagination" - Immanuel Kant
- "No man's knowledge here can go beyond his experience" - John Locke
- "God is not willing to do everything, and thus take away our free will and that share of glory which belongs to us" - Niccolo Machiavelli
- "Liberty consists in doing what one desires" - John Stuart Mill
- "It is undesirable to believe a proposition when there is no ground whatever for supposing it true" - Bertrand Russell
- "Even while they teach, men learn" - Seneca the Younger
- "There is only one good, knowledge, and one evil, ignorance" - Socrates
- "If God did not exist, it would be necessary to invent Him" - Voltaire
- "This is patently absurd; but whoever wishes to become a philosopher must learn not to be frightened by absurdities" - Bertrand Russell
- "One cannot conceive anything so strange and so implausible that it has not already been said by one philosopher or another" - René Descartes
- "Leisure is the mother of philosophy" - Thomas Hobbes
- "Philosophy is a battle against the bewitchment of our intelligence by means of language" - Ludwig Wittgenstein
- "There is only one thing a philosopher can be relied upon to do, and that is to contradict other philosophers" - William James
- "We are what we repeatedly do. Excellence, then, is not an act, but a habit" - Aristotle
- "Only one man ever understood me, and he didn’t understand me" - G. W. F. Hegel
- "The mind is furnished with ideas by experience alone" - John Locke
- "Life must be understood backward. But it must be lived forward " - Søren Kierkegaard
- "Science is what you know. Philosophy is what you don't know" - Bertrand Russell
- "Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck" - Immanuel Kant
- "Philosophy is at once the most sublime and the most trivial of human pursuits" - William James
- "History is Philosophy teaching by examples" - Thucydides
- "He who is unable to live in society, or who has no need because he is sufficient for himself, must be either a beast or a god" - Aristotle
- "You can discover more about a person in an hour of play than in a year of conversation" - Plato
- "Things alter for the worse spontaneously, if they be not altered for the better designedly" - Francis Bacon
- "All that is necessary for the triumph of evil is that good men do nothing" - mistakenly attributed to Edmund Burke
- "Is man merely a mistake of God's? Or God merely a mistake of man's?" - Friedrich Nietzsche
- "I would never die for my beliefs because I might be wrong" - Bertrand Russell
- "Religion is the sign of the oppressed ... it is the opium of the people" - Karl Marx
- "Happiness is the highest good" - Aristotle
- "If men were born free, they would, so long as they remained free, form no conception of good and evil" - Baruch Spinoza
- "The greater the difficulty, the more glory in surmounting it" - Epicurus
- "Whatever is reasonable is true, and whatever is true is reasonable" - G. W. F. Hegel
- "Morality is not the doctrine of how we may make ourselves happy, but of how we may make ourselves worthy of happiness" - Immanuel Kant
- "Man is condemned to be free" - Jean-Paul Sartre
- "It is one thing to show a man that he is in error, and another to put him in possession of truth" - John Locke
- "I don’t know why we are here, but I’m pretty sure it is not in order to enjoy ourselves" - Ludwig Wittgenstein
- "That man is wisest who, like Socrates, realizes that his wisdom is worthless" - Plato
- "The only thing I know is that I know nothing" - Socrates
- "All is for the best in the best of all possible worlds" - Voltaire (in parody of Leibniz)
- "The function of prayer is not to influence God, but rather to change the nature of the one who prays" - Søren Kierkegaard
- "Man is born free, but is everywhere in chains" - Jean-Jacques Rousseau
- "Man will never be free until the last king is strangled with the entrails of the last priest" - Denis Diderot
- "If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things" - René Descartes
- "Happiness lies in virtuous activity, and perfect happiness lies in the best activity, which is contemplative" - Aristotle
- "I can control my passions and emotions if I can understand their nature" - Spinoza
- "Philosophers have hitherto only interpreted the world in various ways; the point, however, is to change it" - Karl Marx
- "It is wrong always, everywhere and for everyone, to believe anything upon insufficient evidence" - W. K. Clifford
- "Virtue is nothing else than right reason" - Seneca the Younger
- "Freedom is secured not by the fulfilling of one's desires, but by the removal of desire" - Epictetus
- "In everything, there is a share of everything" - Anaxagoras
- "A little philosophy inclineth man's mind to atheism; but depth in philosophy bringeth men’s minds about to religion" - Sir Francis Bacon
- "The brave man is he who overcomes not only his enemies but his pleasures" - Democritus
- "Good and evil, reward and punishment, are the only motives to a rational creature" - John Locke
- "To do as one would be done by, and to love one's neighbor as oneself, constitute the ideal perfection of utilitarian morality" - John Stuart Mill
- "Everything that exists is born for no reason, carries on living through weakness, and dies by accident" - Jean-Paul Sartre
- "Man is the measure of all things" - Protagoras
- "We are too weak to discover the truth by reason alone" - St. Augustine
- "The mind is furnished with ideas by experience alone" - John Locke
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