A body in motion can maintain this motion only if it remains in contact with a mover.

The high-minded man does not bear grudges, for it is not the mark of a great soul to remember injuries, but to forget them.

But nature flies from the infinite; for the infinite is imperfect, and nature always seeks an end.

To know what virtue is is not enough; we must endeavor to possess and to practice it, or in some other manner actually ourselves to become good.

No science ever defends its first principles.

We are what we repeatedly do.

A good style must have an air of novelty, at the same time concealing its art.