Men are especially intolerant of serving and being ruled by, their equals.

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

Freedom is absolutely necessary for the progress in science and the liberal arts.

I believe that a triangle, if it could speak, would say that God is eminently triangular, and a circle that the divine nature is eminently circular; and thus would every one ascribe his own attributes to God.

In proportion as we endeavor to live according to the guidance of reason, shall we strive as much as possible to depend less on hope, to liberate ourselves from fear, to rule fortune, and to direct our actions by the sure counsels of reason.

He who seeks equality between unequals seeks an absurdity.

Everything in nature is a cause from which there flows some effect.