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.

I do not believe anyone has reached such perfection, surpassing all others, except Christ, to whom God immediately revealed - without words or visions - the conditions which lead to salvation.

Measure, time and number are nothing but modes of thought or rather of imagination.

Hatred which is completely vanquished by love passes into love: and love is thereupon greater than if hatred had not preceded it.

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.

Blessedness is not the reward of virtue but virtue itself.

In the mind there is no absolute or free will; but the mind is determined to wish this or that by a cause, which has also been determined by another cause, and this last by another cause, and so on to infinity.