“The perilous time for the most highly gifted is not youth. The holy sensibilities of genius — for all the sensibilities of genius are holy — keep their possessor essentially unhurt as long as animal spirits and the idea of being young last; but the perilous season is middle age, when a false wisdom tempts them to doubt the divine origin of the dreams of their youth; when the world comes to them, not with the song of the siren, against which all books warn us, but as a wise old man counselling acquiescence in what is below them.”