Morals are in all countries the result of legislation and government; they are not African or Asian or European: they are good or bad.
My ideas are my whores.
There is no moral precept that does not have something inconvenient about it.
Although a man may wear fine clothing, if he lives peacefully; and is good, self-possessed, has faith and is pure; and if he does not hurt any living being, he is a holy man.
No man has received from nature the right to command his fellow human beings.
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.
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.
It is very important not to mistake hemlock for parsley, but to believe or not believe in God is not important at all.
Virtue is praised but hated. People run away from it for it is ice-cold and in this world you must keep your feet warm.
Disturbances in society are never more fearful than when those who are stirring up the trouble can use the pretext of religion to mask their true designs.
Poetry must have something in it that is barbaric, vast and wild.
People praise virtue, but they hate it, they run away from it. It freezes you to death, and in this world you've got to keep your feet warm.