In the days of the Roman Republic, the imperator of a particularly successful or important military campaign was occasionally awarded a triumph. This festive ceremony featured a parade of captured bounty and prisoners, interspersed with Roman soldiers signing bawdy songs about their commander, who would wave to the cheering crowds from the back of a chariot. And behind the chariot would walk a slave, whose sole job was to whisper in the ear of the conquering hero "Remember that thou art mortal."
Oportet nos omnes spem.