What Idealistic Theories Disclose.—We are most certain to find idealistic theories among unscrupulously practical men; for such men stand in need of the lustre of these theories for the sake of their reputation. They adopt them instinctively without by any means feeling hypocritical in doing so—no more hypocritical than Englishmen with their Christianity and their Sabbath-keeping. On the other hand, contemplative natures who have to keep themselves on the guard against all kinds of fantasies and who dread to be reputed as enthusiasts, are only to be satisfied with hard realistic theories: they take possession of them under the same instinctive compulsion without thereby losing their honesty.