Things which are accidentally the causes either of hope or fear are called good or evil omens.

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.

He alone is free who lives with free consent under the entire guidance of reason

Minds, however, are conquered not by arms, but by love and nobility.

I do not know how to teach philosophy without becoming a disturber of the peace.

The more you struggle to live, the less you live. Give up the notion that you must be sure of what you are doing. Instead, surrender to what is real within you, for that alone is sure….you are above everything distressing.

I have made a ceaseless effort not to ridicule, not to bewail, not to scorn human actions, but to understand them.

The good which every man, who follows after virtue, desires for himself he will also desire for other men…

The highest activity a human being can attain is learning for understanding, because to understand is to be free.