Makes an interesting read given our contemporary understanding of genetics, DNA and the heritable component of intelligence and behavior.
I. Come let us consider what one might say on the education of free children, and by what training they would become good citizens.
II. It is perhaps best to begin with birth: I would therefore warn those who desire to be fathers of notable sons, not to form connections with any kind of women, such as courtesans or mistresses: for those who either on the father or mother's side are ill-born have the disgrace of their origin all their life long irretrievably present with them, and offer a ready handle to abuse and vituperation. So that the poet was wise, who said, "Unless the foundation of a house be well laid, the descendants must of necessity be unfortunate." Good birth indeed brings with it a store of assurance, which ought to be greatly valued by all who desire legitimate offspring.