Skepticism, like chastity, should not be relinquished too readily.

An ideal cannot wait for its realization to prove its validity.

Periods of tranquillity are seldom prolific of creative achievement. Mankind has to be stirred up.

Let a man once overcome his selfish terror at his own finitude, and his finitude itself is, in one sense, overcome.

The God to whom depth in philosophy bring back men's minds is far from being the same from whom a little philosophy estranges them

My soul hates the fool whose only passion is to live by rule.

Sanctity and genius are as rebellious as vice.