Only passions, great passions can elevate the soul to great things.

The philosopher has never killed any priests, whereas the priest has killed a great many philosophers.

There is only one passion, the passion for happiness.

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.