Sin cannot be conceived in a natural state, but only in a civil state, where it is decreed by common consent what is good or bad.

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

We feel and know that we are eternal.

Many errors, of a truth, consist merely in the application of the wrong names of things. For if a man says that the lines which are drawn from the centre of the circle to the circumference are not equal, he understands by the circle, at all events for the time, something else than mathematicians understand by it.

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

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.

Reality and perfection are synonymous.