One will rarely err if extreme actions be ascribed to vanity, ordinary actions to habit, and mean actions to fear.

These small things - nutrition, place, climate, recreation, the whole casuistry of selfishness - are inconceivably more important than everything one has taken to be important so far.

The enjoyment that all morality has given us to now and that it continues to give us--and so, what has kept it going up to now--lies in everyone's right, without lengthy investigation, to praise and blame. And who could endure life without praising and blaming!

For the purpose of knowledge we must know how to make use of the inward current which draws us towards a thing, and also of the current which after a time draws us away from it.

Even in the lust of knowledge I feel only my will's delight in begetting and becoming; and if there be innocence in my knowledge it is because my procreative will is in it.

There is no more dangerous error than that of mistaking the consequence for the cause.

Fathers have a lot to do to make up for having sons.