A man is as much affected pleasurably or painfully by the image of a thing past or future as by the image of a thing present.

Men are especially intolerant of serving and being ruled by, their equals.

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.

I do not know how to teach philosophy without becoming a disturber of established religion.

If men were born free, they would, so long as they remained free, form no conception of good and evil.

In the mind there is no absolute or free will.

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.