Philosophy hasn't made any progress? - If somebody scratches the spot where he has an itch, do we have to see some progress? Isn't genuine scratching otherwise, or genuine itching itching? And can't this reaction to an irritation continue in the same way for a long time before a cure for the itching is discovered?
If I write a new play, my point of view may be profoundly modified. I may be obliged to contradict myself and I may no longer know whether I still think what I think.