Even a man's exact imitation of the song of the nightingale displeases us when we discover that it is a mimicry, and not the nightingale.

Physicians think they are doing something for you by labeling what you have as a disease

We ourselves introduce that order and regularity in the appearance which we entitle "nature". We could never find them in appearances had we not ourselves, by the nature of our own mind, originally set them there.

An action, to have moral worth, must be done from duty.

It is not God's will merely that we should be happy, but that we should make ourselves happy

Freedom in the practical sense is the independence of the power of choice from necessitation by impulses of sensibility

It is difficult for the isolated individual to work himself out of the immaturity which has become almost natural for him.