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.
There are three principal means of acquiring knowledge… observation of nature, reflection, and experimentation. Observation collects facts reflection combines them experimentation verifies the result of that combination.
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.
The philosopher has never killed any priests, whereas the priest has killed a great many philosophers.
Morals are in all countries the result of legislation and government they are not African or Asian or European: they are good or bad.