κάλλιστον ἐφόδιον τῷ γήρᾳ ἡ παιδεία (Aristotle, quoted by Diogenes Laertius 5.21) → the finest provision for old age is education
κυριόδουλος, ὁ (Μ)κύριος και ταυτόχρονα δούλος.