Perhaps the mediocre sing, tooting their own little tarnished, second-hand horns, slightly off-key but with brilliant celebration. Half-wits and hacks. Thieves and beggars. Those who can see no higher than the horizon, and then can reach that height.
I suspect those who have aspired to something more, something original or valuable, I suspect the greatest minds, envy the attainable height of success reached only by the mediocre, whose pinnacle of success is located so much nearer to earth.