The most unequivocal sign of contempt for man is to regard everybody merely as a means to one's own ends, or of no account whatever.

Metaphysical world.- It is true, there could be a metaphysical world; the absolute possibility of it is hardly to be disputed. We behold all things through the human head and cannot cut off this head; while the question nonetheless remains what of the world would still be there if one had cut it off.

If there is to be art, if there is to be any aesthetic doing and seeing, one physiological condition is indispensable: frenzy.

A high civilization is a pyramid: it can stand only on a broad base; its primary prerequisite is a strong and soundly consolidated mediocrity.

Whoever deliberately attempts to insure confidentiality with another person is usually in doubt as to whether he inspires that person's confidence in him. One who is sure that he inspires confidence attaches little importance to confidentiality.

It is hard enough to remember my opinions, without also remembering my reasons for them!

The 'kingdom of Heaven' is a condition of the heart - not something that comes 'upon the earth' or 'after death.'