He alone is free who lives with free consent under the entire guidance of reason.

I make this chief distinction between religion and superstition, that the latter is founded on ignorance, the former on knowledge.

Indulge yourself in pleasures only in so far as they are necessary for the preservation of health.

The greatest pride, or the greatest despondency, is the greatest ignorance of one's self.

The greatest good is the knowledge of the union which the mind has with the whole nature.

...The body is affected by the image of the thing, in the same way as if the thing were actually present.

He who seeks to regulate everything by law is more likely to arouse vices than to reform them. It is best to grant what cannot be abolished, even though it be in itself harmful. How many evils spring from luxury, envy, avarice, drunkenness and the like, yet these are tolerated because they cannot be prevented by legal enactments.