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

The less the mind understands and the more things it perceives, the greater its power of feigning is; and the more things it understands, the more that power is diminished.

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

God is a thing that thinks.

Men are mistaken in thinking themselves free; their opinion is made up of consciousness of their own actions, and ignorance of the causes by which they are determined.

In the state of nature, wrong-doing is impossible ; or, if anyone does wrong, it is to himself, not to another.

The endeavor to understand is the first and only basis of virtue.