Nothing, Lucilius, is ours, except time. We were entrusted by nature with the ownership of this single thing, so fleeting and slippery that anyone who will can oust us from possession. What fools these mortals be! They allow the cheapest and most useless things, which can easily be replaced, to be charged in the reckoning, after they have acquired them; but they never regard themselves as in debt when they have received some of that precious commodity,—time! And yet time is the one loan which even a grateful recipient cannot repay.
Omnia, Lucili, aliena sunt, tempus tantum nostrum est. In huius rei unius fugacis ac lubricae possessionem natura nos misit, ex qua expellit quicumque vult. Et tanta stultitia mortalium est, ut quae minima et vilissima sunt, certe reparabilia, imputari sibi, cum impetravere, patiantur; nemo se iudicet quicquam debere, qui tempus accepit, cum interim hoc unum est, quod ne gratus quidem potest reddere.
Epistulae Morales 1.3