Nature uses as little as possible of anything.

I used to measure the heavens, now I measure the shadows of Earth.

Fables should be taught as fables, myths as myths, and miracles as poetic fancies.

-- Hypatia

To teach superstitions as truth is a most terrible thing.

-- Hypatia

Once in one's life, everything should be called into doubt.

-- René Descartes

A great many people think they are thinking when they are merely rearranging their prejudices.

-- William James

An investor who has all the answers doesn't even understand the questions.

-- John Templeton

The seeker after truth is not one who studies the writings of the ancients and, following his natural disposition, puts his trust in them, but rather the one who suspects his faith in them and questions what he gathers from them.

-- Ibn al-Haytham