I like Edward Gibbon’s indirect explination:
“His apparent virtues, instead of being the hardy productions of experience and adversity, were the premature and artificial fruits of a royal education. … and the most skilful masters of every science, and of every art, had laboured to form the mind and body of the young prince. … But the influence of this elaborate instruction did not penetrate beyond the surface; and the skilful preceptors, who so accurately guided the steps of their royal pupil, could not infuse into his feeble and indolent character the vigorous and independent principle of action which renders the laborious pursuit of glory essentially necessary to the happiness, and almost to the existence, of the hero.”