“If the first requirement of an adult is that he should take to himself responsibility for his failures, for his life, and for his doing, within the context of the actual conditions of the world in which he dwells, then it is simply an elementary psychological fact that no one will ever develop to this state who is continually thinking of what a great thing he would have been had only the conditions of his life been different: his parents less indifferent to his needs, society less oppressive, or the universe otherwise arranged.”