I can show you that the art of calculation has to do with odd and even numbers in their numerical relations to themselves and to each other.

Just as bees make honey from thyme, the strongest and driest of herbs, so do the wise profit from the most difficult of experiences.

Can any man be courageous who has the fear of death in him?

For all good and evil, whether in the body or in human nature, originates ... in the soul, and overflows from thence, as from the head into the eyes.

Consider how great is the encouragement which all the world gives to the lover; neither is he supposed to be doing anything dishonourable; but if he succeeds he is praised, and if he fail he is blamed.

Pleasure is the greatest incentive to evil.

Renouncing the honors at which the world aims, I desire only to know the truth... and to the maximum of power, I exhort all other men to do the same.