diatriba
From LSJ
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
dĭā̆trĭba: ae, f., = διατριβή>,
I a learned discussion.—Transf., a school, Gell. 1, 26; 17, 20, 4 al.