Origen

“ Is it indeed permissible for you, O Greeks, to call youths and slaves and foolish persons to the study of philosophy, but if we do so, we do not act from philanthropic motives in wishing to heal every rational nature with the medicine of reason, and to bring them into fellowship with God, the Creator of all things? ”

“ Do not philosophers invite young men to their lectures? and do they not encourage young men to exchange a wicked life for a better? and do they not desire slaves to learn philosophy? Must we find fault, then, with philosophers who have exhorted slaves to the practice of virtue? ”