George Edward Moore

“ I have tried to define the classes within which all great goods and evils fall; and I have maintained that very many different things are good and evil in themselves, and that neither class of things possesses any other proper which is both common to all its members and peculiar to them.
In order to express the fact that ethical propositions of my first class are incapable of proof or disproof, I have sometimes followed Sidgwick’s usage in calling them ‘Intuitions.’ But I beg that it may be noticed that I am not an ‘Intuitionist,’ in the ordinary sense of the term. ”

“ It becomes plain that, for answers to the first question, no relevant evidence whatever can be adduced: from no other truth, except themselves alone, can it be inferred that they are either true or false. We can guard against error only by taking care, that, when we try to answer a question of this kind, we have before our minds that question only, and not some other or others ”

“ I do not know how far this source of error would be done away, if philosophers would try to discover what question they were asking, before they set about to answer it; for the work of analysis and distinction is often very difficult: we may often fail to make the necessary discovery, even though we make a definite attempt to do so. ”