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.

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.

It is not human nature we should accuse but the despicable conventions that pervert it.

Morals are in all countries the result of legislation and government; they are not African or Asian or European: they are good or bad.