"When we try to be definite, as to what we mean when we say that this or that is "the Good," we find ourselves involved in very great difficulties. Bentham's creed, that pleasure is the Good, roused furious opposition, and was said to be a pig's philosophy. Neither he nor his opponents could advance any argument. In a scientific question, evidence can be adduced on both sides, and, in the end, one side is seen to have the better case — or, if this does not happen, the question is left undecided. But in a question, as to whether this, or that, is the ultimate Good, there is no evidence, either way; each disputant can only appeal to his own emotions, and employ such rhetorical devices as shall rouse similar emotions in others … Questions as to "values" — that is to say, as to what is good or bad on its own account, independently of its effects — lie outside the domain of science, as the defenders of religion emphatically assert. I think that, in this, they are right, but, I draw the further conclusion, which they do not draw, that questions as to "values" lie wholly outside the domain of knowledge. That is to say, when we assert that this, or that, has "value", we are giving expression to our own emotions, not to a fact, which would still be true if our personal feelings were different."