ὁ χρόνος ἐστὶ δάνος, τὸ ζῆν πικρός ἐσθ' ὁ δανίσας → time is a loan, and he who lent you life is a hard creditor | time is on loan and life's lender is a prick
quernus: a, um, adj. quercus; cf. querneus,
I of oaks, oaken, oak- (poet.): quernas glandes tum stringere tempus, Verg. G. 1, 305: vimen, id. A. 11, 65: stipes, Ov. F. 4, 333: corona, a garland of oak-leaves, id. Tr. 3, 1, 36.