It’s ancient Latin, used in Rome by clergymen to appraise rising stars amongst their order. Later it was adopted by the Legion as a battle cry, and the last words uttered by General Corbulo before he fell upon his own sword at the utterance of Nero.
It translates to, “I am worthy.”
Consider: for that to be a battlecry of the Legionnaires, footsoldiers and canon fodder to be ground against the foreign hordes that threatened the rule of Rome, for every single one of those infinitesimal men to shout, “I am worthy!” as they marched to their deaths, for Corbulo to say it as he was forced to execute himself on the whims of a spoilt brat…
Personally, I find it inspiring.
Self esteem is a taxing thing, not suited to our generation. “Why are so few of us left active, healthy, and without personality disorders?” The Romans conquered half the world once, and they understood that each and every one of them was worthy before such greater men and gods than they.