Knowledge shrinks as wisdom grows.

I have always noticed that deeply and truly religious persons are fond of a joke, and I am suspicious of those who aren't.

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

Each generation criticizes the unconscious assumptions made by its parent. It may assent to them, but it brings them out in the open.

There is no more common error than to assume that, because prolonged and accurate mathematical calculations have been made, the application of the result to some fact of nature is absolutely certain.

Every philosophy is tinged with the coloring of some secret imaginative background, which never emerges explicitly into its train of reasoning.

You cannot evade quantity. You may fly to poetry and music, and quantity and number will face you in your rhythms and your octaves.