Except God no substance can be granted or conceived. .. Everything, I say, is in God, and all things which are made, are made by the laws of the infinite nature of God, and necessarily follows from the necessity of his essence.

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.

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

I 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.

All happiness or unhappiness solely depends upon the quality of the object to which we are attached by love.

The human mind cannot be absolutely destroyed along with the body, but something of it remains, which is eternal.

Whatsoever is contrary to nature is contrary to reason, and whatsoever is contrary to reason is absurd.