Nature uses as little as possible of anything.

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

To teach superstitions as truth is a most terrible thing.

-- Hypatia

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

-- 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 duty of the man who investigates the writings of scientists, if learning the truth is his goal, is to make himself an enemy of all that he reads.

-- Ibn al-Haytham