I find, as a practicing critic, that very few men who write books are even as tolerant as I am—that most of them, soon or late, show signs of extreme discomfort under criticism, however polite its terms. Perhaps this is why enduring friendships between authors and critics are so rare. All artists, of course, dislike one another more or less, but that dislike seldom rises to implacable enmity, save between opera singer and opera singer, and creative author and critic. Even when the latter two keep up an outward show of good-will, there is always bitter antagonism under the surface. Part of it, I daresay, arises out of the impossible demands of the critic, particularly if he be tinged with the constructive madness. Having favored an author with his good opinion, he expects the poor fellow to live up to that good opinion without the slightest compromise or faltering, and this is commonly beyond human power. He feels that any let-down compromises _him_—that his hero is stabbing him in the back, and making him ridiculous—and this feeling rasps his vanity. The most bitter of all literary quarrels are those between critics and creative artists, and most of them arise in just this way. As for the creative artist, he on his part naturally resents the critic’s air of pedagogical superiority and he resents it especially when he has an uneasy feeling that he has fallen short of his best work, and that the discontent of the critic is thus justified. Injustice is relatively easy to bear; what stings is justice. Under it all, of course, lurks the fact that I began with: the fact that the critic is himself an artist, and that his creative impulse, soon or late, is bound to make him neglect the punctilio. When he sits down to compose his criticism, his artist ceases to be a friend, and becomes mere raw material for his work of art. It is my experience that artists invariably resent this cavalier use of them. They are pleased so long as the critic confines himself to the modest business of interpreting them—preferably in terms of their own estimate of themselves—but the moment he proceeds to adorn their theme with variations of his own, the moment he brings new ideas to the enterprise and begins contrasting them with their ideas, that moment they grow restive. It is precisely at this point, of course, that criticism becomes genuine criticism; before that it was mere reviewing. When a critic passes it he loses his friends. By becoming an artist, he becomes the foe of all other artists.