True virtue is life under the direction of reason.

Whatever increases, decreases, limits or extends the body's power of action, increases decreases, limits, or extends the mind's power of action. And whatever increases, decreases, limits, or extends the mind's power of action, also increases, decreases, limits, or extends the body's power of action.

Nothing in nature is by chance... Something appears to be chance only because of our lack of knowledge.

Human infirmity in moderating and checking the emotions I name bondage : for, when a man is a prey to his emotions, he is not his own master, but lies at the mercy of fortune : so much so, that he is often compelled, while seeing that which is better for him, to follow that which is worse.

The highest endeavor of the mind, and the highest virtue, it to understand things by intuition.

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.

Love or hatred towards a thing, which we conceive to be free, must, other things being similar, be greater than if it were felt towards a thing acting by necessity.