What doesn't kill you, only makes you stronger

He who fights with monsters might take care lest he thereby become a monster. Is not life a hundred times too short for us to bore ourselves?

All truly great thoughts are conceived by walking.

What is great in man is that he is a bridge and not a goal: what there is to love in man is that he is a going-over and a going-under.

Ye shall only have foes to be hated; but not foes to be despised: ye must be proud of your foes.

What, if some day or night a demon were to steal after you into your loneliest loneliness and say to you: 'This life as you now live it and have lived it, you will have to live once more and innumerable times more' ... Would you not throw yourself down and gnash your teeth and curse the demon who spoke thus? Or have you once experienced a tremendous moment when you would have answered him: 'You are a god and never have I heard anything more divine.

If we affirm one moment, we thus affirm not only ourselves but all existence. For nothing is self-sufficient, neither in us ourselves nor in things; and if our soul has trembled with happiness and sounded like a harp string just once, all eternity was needed to produce this one event - and in this single moment of affirmation all eternity was called good, redeemed, justified, and affirmed.