Never repeat old grievances.

This is my father. Try what you can with him! He won't listen to me, because he remembers what a fool I was when I was a baby.

Hegel was right when he said that we learn from history that men never learn anything from history.

Beware of false knowledge; it is more dangerous than ignorance.

Beware of the man who does not return your blow: he neither forgives you nor allows you to forgive yourself.

I'm an atheist and I thank God for it.

Man is the only animal of which I am thoroughly and cravenly afraid...There is no harm in a well-fed lion. It has no ideals, no sect, no party.