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.

Truth is sought for its own sake. And those who are engaged upon the quest for anything for its own sake are not interested in other things.

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

I much prefer the sharpest criticism of a single intelligent man to the thoughtless approval of the masses.

-- Johannes Kepler

An experiment is a question which science poses to Nature, and a measurement is the recording of Nature's answer.

-- Max Planck