In this modern world, the celibacy of the medieval learned class has been replaced by a celibacy of the intellect which is divorced from the concrete contemplation of the complete facts.

Ideas won't keep. Something must be done about them.

The science of pure mathematics, in its modern developments, may claim to be the most original creation of the human spirit.

Dogmatism is the anti-Christ of learning.

Our rate of progress is such that an individual human being, of ordinary length of life, will be called on to face novel situations which find no parallel in his past. The fixed person, for the fixed duties, who, in older societies was such a godsend, in the future will be a public danger.

I consider Christian theology to be one of the great disasters of the human race.

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