"Yet notwithstanding these and other discouraging circumstances among the Romans, their slaves were often their rarest artists. They excelled, too, in science, insomuch as to be usually employed as tutors to their master’s children. Epictetus, Diogenes, Phaedon, Terence, and Phædrus, were slaves. But they were of the race of whites. It is not their condition then, but nature, which has produced the distinction."