The possibility of divorce renders both marriage partners stricter in their observance of the duties they owe to each other. Divorces help to improve morals and to increase the population.

Only a very bad theologian would confuse the certainty that follows revelation with the truths that are revealed. They are entirely different things.

Good music is very close to primitive language.

Gaiety is a quality of ordinary men. Genius always presupposes some disorder in the machine.

All abstract sciences are nothing but the study of relations between signs.

Our observation of nature must be diligent, our reflection profound, and our experiments exact. We rarely see these three means combined; and for this reason, creative geniuses are not common.