All of us want, and most of us take for granted, a real beauty in whose light it is irrelevant that Longfellow is read by a larger number of people than is Shelley. If I really love Shelley, I must believe that in some impersonal sense _Prometheus Unbound_ is superior to _The Psalm of Life_. This insistence upon a standard is at the root of all our serious thinking; _de gustibus non disputandum_ is a foolish saying: for nothing as a matter of fact is more fiercely disputed than questions of taste. The social character of thought is so firmly rooted that a thought which is limited to a personal impression ceases to interest us. It has become a mere fact; and we live in a world not of mere facts but of facts which gain their importance only through meaning. It is only of the most trivial acts that we say: This is right for me but wrong for you, because you think it wrong. We do not really even then put the You and the I on the same level, but imply that you will, if properly educated, agree with me. Human nature demands that we habitually will that the maxim of our thought at least, should become a universal law. Only when we apply our convictions, æsthetic, ethical, or metaphysical, to others outside ourselves, do they become more than fancies.
If we go the whole way with Professor Sumner, for example, in the relativity of morals, we are not really, from the standpoint of modern Western teaching, looking tolerantly upon other theories which approve, for instance, the summary extermination of undesirable members of the family. We are simply refusing to adopt the morality of our own or any other age, more seriously than as a guide of conduct whereby we avoid punishment by society. The owning of slaves in the United States, says Professor Sumner, is no longer expedient; but, under changes of social and industrial conditions, it may again become so. Morality, that is, is what its etymology implies--simply custom.
The holder of such a theory has no real conviction of the position which, by geographical and temporal accidents, he holds. He is really trying to place himself at the center of indifference, and his one conviction is that all standards are relative. Of opposition to this, he is frequently intolerant enough. The man who holds that Buddhism best meets the religious needs of India, as Christianity satisfies the conditions of life in the West, thinks himself tolerant of religious differences, because all the examples are on his side; but he is intolerant--and on his premises justly so--of missionaries, who are his real opponents.