A true philosopher can no more pass by the open door of a free discussion than an alcoholic can pass by the open door of a saloon. Since my hosts have been kind enough to invite me to say what I think, the highest compliment I can pay to their tolerance and liberality will be to do just that. This is not going to be a debate. I would be the most unteachable of mortals if at this stage of life I still believed that one could get anywhere arguing with a dialectician. One might as well attempt to pacify or intimidate a walrus by tossing sardines at him as to bait a philosopher with arguments. I have accepted your kind invitation because I think the subject is worth discussing.