I can tell by my own reaction to it that this book is harmful." But let him only wait and perhaps one day he will admit to himself that this same book has done him a great service by bringing out the hidden sickness of his heart and making it visible.— Altered opinions do not alter a man’s character (or do so very little); but they do illuminate individual aspects of the constellation of his personality which with a different constellation of opinions had hitherto remained dark and unrecognizable.

You lovers of knowledge! So what have you done out of your love of knowledge up to now? Have you already stolen and murdered so as to know how a thief and a murderer feels?

And as long as you are in any way ashamed before yourself, you do not yet belong with us.

There are no moral phenomena at all, but only a moral interpretation of phenomena.

Help thyself: then everyone will help thee too. Principle of Christian charity.

love as a passion—it is our European specialty—must absolutely be of noble origin; as is well known, its invention is due to the Provencal poet-cavaliers, those brilliant, ingenious men of the "gai saber," to whom Europe owes so much, and almost owes itself.

The vanity of others runs counter to our taste only when it runs counter to our vanity.