Noise is the most impertinent of all forms of interruption. It is not only an interruption, but also a disruption of thought.

Empirical sciences prosecuted purely for their own sake, and without philosophic tendency are like a face without eyes.

Every state of welfare, every feeling of satisfaction, is negative in its character; that is to say, it consists in freedom from pain, which is the positive element of existence.

It is a clear gain to sacrifice pleasure in order to avoid pain.

Animals hear about death for the first time when they die.

Sleep is the interest we have to pay on the capital which is called in at death; and the higher the rate of interest and the more regularly it is paid, the further the date of redemption is postponed.

Shame on such a morality that is worthy of pariahs, and that fails to recognize the eternal essence that exists in every living thing, and shines forth with inscrutable significance from all eyes that see the sun!