Carpe Diem

Happy the man, and happy he alone,

He, who can call today his own:

He, who, secure within, can say

Tomorrow, do thy worst, for l have lived today.

Be fair, or foul, or rain, or shine,

The joys l have possest, in spite of fate, are mine.

Not Heav’n itself upon the past has power;

But what has been, has been, and l have had my hour.

https://www.bartleby.com/204/190.html Translations with less power: https://newepicurean.com/quintus-horatius-flaccus-horace-ode-3-29/

Horace, from the 29th Ode of the third book.