The proper study of a wise man is not how to die but how to live.

He who lives according to the guidance of reason strives as much as possible to repay the hatred, anger, or contempt of others towards himself with love or generosity. ...hatred is increased by reciprocal hatred, and, on the other hand, can be extinguished by love, so that hatred passes into love.

The greatest pride, or the greatest despondency, is the greatest ignorance of one's self.

So long as a man imagines that he cannot do this or that, so long as he is determined not to do it; and consequently so long as it is impossible to him that he should do it.

Freedom is self-determination.

I should attempt to treat human vice and folly geometrically... the passions of hatred, anger, envy, and so on, considered in themselves, follow from the necessity and efficacy of nature... I shall, therefore, treat the nature and strength of the emotion in exactly the same manner, as though I were concerned with lines, planes, and solids.

The greatest good is the knowledge of the union which the mind has with the whole nature.