Necessity is not an established fact, but an interpretation.

All idealism is falsehood in the face of necessity

In order to acquire intellect one must need it. One loses it when it is no longer necessary.

One hears but one does not seek; one takes -- one does not ask who gives; a thought flashes up like lightning, it comes of necessity and unfalteringly formed.

No small art is it to sleep: it is necessary for that purpose to keep awake all day.

Not necessity, not desire /no, the love of power is the demon of men. Let them have everything /health, food, a place to live, entertainment /they are and remain unhappy and low-spirited: for the demon waits and waits and will be satisfied.