The terms good and bad indicate no positive quality in things regarded in themselves, but are merely modes of thinking or notions, which we form from the comparison of things one with another. Thus one and the same thing can be at the same time good, bad, and indifferent. For instance, music is good for him that is melancholy, bad for him that mourns; for him that is deaf; it is neither good nor bad.
Baruch SpinozaThe greatest pride, or the greatest despondency, is the greatest ignorance of one's self.
Baruch SpinozaI have resolved to demonstrate by a certain and undoubted course of argument, or to deduce from the very condition of human nature, not what is new and unheard of, but only such things as agree best with practice.
Baruch SpinozaAll happiness or unhappiness solely depends upon the quality of the object to which we are attached by love.
Baruch Spinoza