"If that be so," I replied, "the method of judging about Good can certainly not be scientific; for judgments about Good are judgments of what ought to be, not of what is." "But then," objected Wilson, "what method is left you? You have nothing to fall back upon but a chaos of opinions." "But might there not be some way of judging between opinions?" "How should there be, in the absence of any external objective test?" "What do you mean by that?" "Why," he replied, "the kind of test which you have in the case of the sciences. They depend, in the last resort, not on ideas of ours, but on the routine of common sense-perception; a routine which is independent of our choice or will, but is forced upon us from without with an absolute authority such as no imaginings of our own can impugn. Thus we get a certainty upon which, by the power of inference, whose mechanism we need not now discuss, we are able to build up a knowledge of what is. But when, on the other hand, we turn to such of our ideas as deal with the Good, the Beautiful, and the like--here we have no test external to ourselves, no authority superior and independent. Invite a group of men to witness a scientific experiment, and none of them will be able to deny either the sequence of the phenomena produced, or the chain of reasoning (supposing it to be sound) which leads to the conclusion based upon them. Invite the same men to judge of a picture, or consult them on a question of moral casuistry, and they will propound the most opposite opinions; nor will there be any objective test by which you can affirm that one opinion is more correct than another. The deliverances of the external sense are, or at least can be made, by correction of the personal equation, infallible and the same for all; those of the internal sense are different not only in different persons, but in the same person at different times." "Yes," said Leslie, impatiently, "we have all admitted that! The question is whether--" "Excuse me," Wilson interposed, "I haven't yet come to my main point. I was going to say that not merely are there these differences of opinion, but even if there were not, even if the opinions were uniform, they would still, as opinions, be subjective and devoid of scientific validity. It is the external reference that gives its certainty to science; and such a reference is impossible in the case of judgments about the Beautiful and the Good. Such judgments are merely records of what we think or feel. These ideas of ours may or may not happen to be consistent one with another; but whether they are so or not, they are merely our ideas, and have nothing to do with the essential nature of reality."