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.

Deep down, there is in the substance of the cosmos a primordial disposition, sui generis, for self-arrangement and self-involution.

We define ourselves as intelligent. That's odd, because we're doing the definition - We're creating our own definition and saying, 'We are intelligent!'

If you're not having a good time, find something else that gives you some joy in life.