The Vain Man's Blood

The vain person rejoices over every good opinion which he hears about himself, quite apart from the point of view of its usefulness. The slave too, who immediately afterwards falls prostrate himself before these opinions, as though he had not called them forth. A species originates, and a type becomes established and strong, in a long struggle with essentially constant unfavourable conditions. On the other hand, it is known by the experience of breeders, that species which receives superabundant nourishment, tend in the most marked way to develop variations. These qualities it calls virtues, and these virtues alone it develops to maturity.