Boothby: Opportunity Described

With sand perpetually that flows,
And ample scythe that all things mows,
One lock before and bald behind,
Is Time. When opposite you find,
Seize him in front. Jove ruling all,
Occasion past can ne'er recall.
Thus did the ancients Time display,
To warn the danger of delay.

Source: Boothby - Phaedrus 5.8.

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(not in Mille) Perry530