The humbleness of a warrior is not the humbleness of the beggar. The warrior lowers his head to no one, but at the same time, he doesn't permit anyone to lower his head to him. The beggar, on the other hand, falls to his knees at the drop of a hat and scrapes the floor to anyone he deems to be higher; but at the same time, he demands that someone lower than him scrape the floor for him.
Aristotle
Also our fellow competitors, who are indeed the people just mentioned - we do not compete with men who lived a hundred centuries ago, or those yet not born, or the dead, or those who dwell near the Pillars of Hercules, or those whom, in our opinion or that of others, we take to be far below us or far above us. So too we compete with those who follow the same ends as ourselves; we compete with our rivals in sport or in love, and generally with those who are after the same things; and it is therefore these whom we are bound to envy beyond all others. Hence the saying.
