“It is perfectly true that a certain amount of leisure is absolutely necessary for the artistic, scientific, and mental development of man; creative leisure followed by the healthy exercise of daily labor, one that is well earned and is socially provided for all according to individual capacities and preferences. Human nature is so constituted that the propensity for evil is always intensified by external circumstances, and the morality of the individual depends much more on the conditions of his existence and the environment in which he lives than on his own will.”