The sick are the greatest danger for the healthy; it is not from the strongest that harm comes to the strong, but from the weakest. - Friedrich Nietzsche

Niemand kann dir die Brücke bauen, auf der gerade du über den Fluß des Lebens schreiten mußt, niemand außer dir allein.

Mathematics would certainly have not come into existence if one had known from the beginning that there was in nature no exactly straight line, no actual circle, no absolute magnitude.

The feelings of devotion, self-sacrifice for one's neighbor, the whole morality of self-denial must be questioned mercilessly and taken to court.... There is too much charm and sugar in these feelings of 'for others,' 'not for myself,' for us not to need to become doubly suspicious at this point and to ask: 'are these not perhaps-seductions?