Peter Abelard

“The first key to wisdom is assiduous and frequent questioning. For by doubting we come to inquiry, and by inquiry we arrive at truth.”


“Appearances are often deceiving.”


It is the mark of and educated mind to be able to entertain a thought without accepting it.

Marcus Aurelius

“If anyone can refute me, show me I’m making a mistake or looking at things from the wrong perspective, I’ll gladly change. It’s the truth I’m after, and the truth never harmed anyone.”

Ludwig Börne

“Losing an illusion makes you wiser than finding a truth.”

Marcus Tullius Cicero


“Anyone can err, but only the fool persists in his fault.” (Philippica XII, 5)


I am not ashamed to confess ignorance of which I do not know.”


“Nothing is so unbelievable that oratory cannot make it acceptable.”

Gaius Julius Caesar

“Men in general are quick to believe that which they wish to be true.”

Norman Cousins

“Wisdom consists of the anticipation of consequences.”

Matt Dillahunty

“I want to believe as many true things and as few false things as possible.”


“Talk sense to a fool and he calls you foolish.”


“It is impossible for a man to learn what he thinks he already knows.”

Johann Wolfgang von Goethe


“Knowing is not enough; we must apply. Willing is not enough; we must do.”


“Hatred is something peculiar. You will always find it strongest and most violent when there is the lowest degree of culture.”

Stephen Hawking

“The greatest obstacle to discovery is not ignorance, it is the illusion of knowledge.”

Hermann Hesse

“Knowledge can be conveyed, but not wisdom. It can be found, it can be lived, it is possible to be carried by it, miracles can be performed with it, but it cannot be expressed in words and taught.”

  • Siddharta(1922)

Franz Kafka


“A first sign of the beginning of understanding is the wish to die.”


“It’s only because of their stupidity that they’re so sure of themselves.”

  • The Trial

Immanuel Kant

“Science is organized knowledge. Wisdom is organized life.”

John Locke

“There are very few lovers of truth, for truth’s sake, even amongst those who persuade themselves that they are so.”

Michel de Montaigne

“We can be knowledgeable with other men’s knowledge, but we cannot be wise with other men’s wisdom.”


“Yesterday I was clever, so I wanted to change the world. Today I am wise, so I am changing myself.”

Bertrand Russell


“The Intelligent man is not the man who holds such-and-such views but the man who has sound reasons for what he believes and yet does not believe it dogmatically.”


“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt. Even those of the intelligent who believe that they have a nostrum are too individualistic to combine with other intelligent men from whom they differ on minor points.”

  • The Triumph of Stupidity(1933)




“There is only one good, knowledge, and one evil, ignorance.”


“I know that I know nothing.”


“Anyone who holds a true opinion without understanding is like a blind man on the right road.”

  • Republic (Plato, 406 BCE)

Neil Degrasse Tyson

“The Universe is under no obligation to make sense to you.”

Leonardo da Vinci

“The greatest deception men suffer is from their own opinions.”

Oscar Wilde


“A thing is not necessarily true because a man died for it.”


“The truth is rarely pure and never simple.”

  • The Importance of Being Ernest