Outlive your life's work. Seneca, Epistles 4.32.4-5

Seneca advises Lucilius to finish his career soon, and to be content with wealth that meets his needs rather than pursue constantly growing returns, that will never be enough or yield the kind of mental stability that comes from appreciating what you have without striving for more. According to Seneca, we should work enough to live, paying our debt to nature's necessity, and then spend our time rejoicing in contemplation of life's beauty: a good that we possess the moment we notice it.

Vis scire quid sit quod faciat homines avidos futuri? nemo sibi contigit. Optaverunt itaque tibi alia parentes tui; sed ego contra omnium tibi eorum contemptum opto quorum illi copiam. Vota illorum multos compilant ut te locupletent; quidquid ad te transferunt alicui detrahendum est. Opto tibi tui facultatem, ut vagis cogitationibus agitata mens tandem resistat et certa sit, ut placeat sibi et intellectis veris bonis, quae simul intellecta sunt possidentur, aetatis adiectione non egeat. Ille demum necessitates supergressus est et exauctoratus ac liber qui vivit vita peracta. Vale.

You want to know what it is that makes men greedy for the future? Nobody has done enough for himself. Thus your family desire different things for you. I take a contrary position, that you should despise all those things they want you to possess in abundance. Their prayers are beating many other folks down to build your fortune; whatever they bring to you must in turn be seized by someone else. I want you to have full possession of yourself, that your mind may at last be firm and fixed, after being driven so hard by wavering thoughts, plans that refuse to stand still. I want you to be pleased with yourself, and to find yourself furnished in short order with true goods that you appreciate, the sort of goods that we possess the moment we recognize them. The man who lives on after his life's work is finished has escaped into the realms beyond material necessity, realms where he can rest easy and free, having already rendered unto nature the toil that is her due. Farewell.