  Moore was not a systematic philosopher: unlike Reid's philosophy of common sense, Moore's ‘common sense’ is not a system. Even in ethics, where he comes closest to presenting a ‘theory’ he explicitly disavows any aspiration to provide a systematic account of the good. Hence, as the preceding discussions show, Moore's legacy is primarily a collection of arguments, puzzles and challenges. One notable addition to those mentioned already is ‘Moore's paradox’: if I am mistaken about something, then I believe something which is not the case — perhaps that it is raining when it is not. Yet if I attribute this mistake to myself by saying ‘It's not raining but I believe that it is’ my statement is absurd. Why is this so? Why is it absurd for me to say something that it is true about myself? Moore himself thought that the explanation here was just that we generally believe the things we say, so that when saying ‘It's not raining’ I imply that I believe this; but Wittgenstein rightly saw that this explanation was superficial and that Moore had put his finger on a much deeper phenomenon here which concerns our sense of our own identity as thinkers.