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Man's greatest concern is to know how he shall properly fill his place in the universe and correctly understand what he must be in order to be a man.

Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck.

Morality is not the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness.

Nature does nothing in vain, and in the use of means to her goals she is not prodigal.

Nothing is divine but what is agreeable to reason.

Only the descent into the hell of self-knowledge can pave the way to godliness.

Out of the crooked timber of humanity, no straight thing was ever made.

Out of timber so crooked as that from which man is made nothing entirely straight can be carved.

Religion is the recognition of all our duties as divine commands.

Religion is too important a matter to its devotees to be a subject of ridicule. If they indulge in absurdities, they are to be pitied rather than ridiculed.