Pythagoras: "All things are numbers."

Heraclitus: "All things are in flux."

Democritus "Happiness does not lie in wealth or money, but in the soul." Standard T-Shirt

Socrates "The Wisdom of Ignorance." Standard T-shirt

Plato "Be kind, for everyone you meet is fighting a hard battle." Standard T-Shirt

Aristotle "The roots of education are bitter, but the fruit is sweet." Standard T-Shirt

Galileo Galilei "And yet the Earth moves." Standard T-shirt

Leonardo da Vinci "The noblest entertainment is the pleasure of understanding." Standard T-Shirt

Michelangelo "Genius is eternal perseverance." Standard T-shirt

Jean-Jacques Rousseau "To live is not to breathe, but to act." Standard T-shirt

Descartes "I think, therefore I am." Standard T-shirt

Pascal "Man is but one of the weakest reeds in nature, but it is a thinking reed." Standard T-Shirt

Spinoza "There can be no hope without fear, and no fear without hope." Standard T-Shirt

Kant "Copernican Revolution." Standard T-shirt

Hegel "The Owl of Minerva Takes Flight at Dusk." Standard T-Shirt

Kierkegaard "Life can only be understood backwards, but it must be lived forwards." Standard T-Shirt

Newton "For every action there is an equal and opposite reaction." Standard T-Shirt

Leibniz "This world is the best possible world." Standard T-Shirt

Darwin "It is not the strongest of the species that survives, nor the most intelligent that survives; it is the one that is most adaptable to change." Standard T-Shirt

Nietzsche "Thus Spoke Zarathustra." Standard T-shirt

Husserl "Seeing quality is intuition." Standard T-shirt

Wittgenstein "If you don't do anything stupid, you can't do anything clever." Standard T-Shirt

Freud "The mind is like an iceberg." Standard T-shirt