Two positions remain to mankind. One is to believe with the nihilists that all is nothing, that we know nothing, that we can never know anything either about the future, the past, or even the present. For we must remember that he who denies the past and the future and wants to stick to the present is simply a madman. One may as well deny the father and mother and assert the child. It would be equally logical. To deny the past and future, the present must inevitably be denied also. This is one position, that of the nihilists. I have never seen a man who could really become a nihilist for one minute. It is very easy to talk.