We can always get along better by reason and love of truth than by worry of conscience and remorse...we should strive to keep worry from our life.

From what has been said we can clearly understand the nature of Love and Hate. Love is nothing else but pleasure accompanied by the idea of an external cause: Hate is nothing else but pain accompanied by the idea of an external cause. We further see, that he who loves necessarily endeavors to have, and to keep present to him, the object of his love; while he who hates endeavors to remove and destroy the object of his hatred.

The safest way for a state is to lay down the rule that religion is comprised solely in the exercise of charity and justice, and that the rights of rulers in sacred, no less than in secular matters, should merely have to do with actions, but that every man should think what he likes and say what he thinks.

Men will find that they can ... avoid far more easily the perils which beset them on all sides by united action.

The more intelligible a thing is, the more easily it is retained in the memory, and counterwise, the less intelligible it is, the more easily we forget it.

I shall consider human actions and desires in exactly the same manner, as though I were concerned with lines, planes and solids.

If we love something similar to ourselves, we endeavor, as far as we can, to bring it about that it should love us in return.