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The only source of knowledge is experience.

Since we cannot know all that there is to be known about anything, we ought to know a little about everything.

I put forward formless and unresolved notions, as do those who publish doubtful questions to debate in the schools, not to establish the truth but to seek it.

An age is called Dark not because the light fails to shine, but because people refuse to see it.

Every thing secret degenerates, even the administration of justice; nothing is safe that does not show how it can bear discussion , publicity.

We know accurately only when we know little, with knowledge doubt increases.

Ignorance is the curse of God; knowledge is the wing wherewith we fly to heaven.

There is no desire more natural than the desire for knowledge.

Every burned book enlightens the world.

Do the things you know, and you shall learn the truth you need to know.