Seneca · On master and slave
Letters 47.12
“But I have no master,” you say. You are still young; perhaps you will have one. Do you not know at what age Hecuba entered captivity, or Croesus, or the mother of Darius, or Plato, or Diogenes?
Seneca, Letters to Lucilius 47.12, translated by Richard Mott Gummere