The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as poetry.

The conception of the necessary unit of all that is resolves itself into the poverty of the imagination, and a freer logic emancipates us from the straitwaistcoated benevolent institution, which idealism palms off as the totality of being.

We may often do as we please - but we cannot please as we please.

In action, in desire, we must submit perpetually to the tyranny of outside forces; but in thought, in aspiration, we are free, free from our fellowmen, free from the petty planet on which our bodies impotently crawl, free even, while we live, from the tyranny of death.

Boredom is... a vital problem for the moralist, since half the sins of mankind are caused by the fear of it.

Belief in God and a future life makes it possible to go through life with less of stoic courage than is needed by skeptics.

Insight, untested and unsupported, is an uncertain guarantee of the truth.