The unselective knowledge drive resembles the indiscriminate sexual drive--signs of vulgarity!

Oh great star! What would your happiness be if you did not have us to shine for?

Your enemy shall ye seek; your war shall ye wage, and for the sake of your thoughts! And if your thoughts succumb, your uprightness shall still shout triumph thereby!

Denn was ist Freiheit? Dasz man den Willen zur Selbstverantwortlichkeit hat.

Wisdom sets bounds even to knowledge.

The view that honesty is something, and even a virtue, belongs, it is true, to those private opinions which are forbidden in this age of public opinions.

This life as you now live it and have lived it, you will have to live once more and innumerable times more; and there will be nothing new in it, but every pain and every joy and every thought and sigh and everything unutterably small or great in your life will have to return to you, all in the same succession and sequence - even this spider and this moonlight between the trees, and even this moment and I myself. The eternal hourglass of existence is turned upside down again and again, and you with it, speck of dust!