Necessity is not an established fact, but an interpretation.

One must repay good and ill; but why just to the person who did us good or ill?

To use the same words is not a sufficient guarantee of understanding; one must use the same words for the same genus of inward experience; ultimately one must have one's experiences in common.

How far is truth susceptible of embodiment? That is the question, that is the experiment.

One should adpot only those situations in which one is in no need of sham virtues, but rather, like the tight-rope dancer on his tight rope, in which one must either fall or stand--or escape.

All sciences are now under the obligation to prepare the ground for the future task of the philosopher, which is to solve the problem of value, to determine the true hierarchy of values.

The ascetic makes a necessity of virtue.