American thinking, when it concerns itself with beautiful letters as when it concerns itself with religious dogma or political theory, is extraordinarily timid and superficial ... [I]t evades the genuinely serious problems of art and life as if they were stringently taboo ... [T]he outward virtues it undoubtedly shows are always the virtues, not of profundity, not of courage, not of originality, but merely those of an emasculated and often very trashy dilettantism.