Alfred North Whitehead

Intelligence is quickness to apprehend as distinct form ability, which is capacity to act wisely on the thing apprehended.

Fools act on imagination without knowledge, pedants act on knowledge without imagination.

Ideas won't keep; something must be done about them.

If you take Darwin's theory and extend it to its logical end, it can be used to justify a number of very horrendous things.

It has been well said that tea is suggestive of a thousand wants, from which spring the decencies and luxuries of civilization.

It is characteristic of science that the full explanations are often seized in their essence by the percipient scientist long in advance of any possible proof.