...Or whats a heaven for?

.......painting from myself and to myself,
Know what I do, am unmoved by men's blame
Or their praise either. Somebody remarks
Morello's outline there is wrongly traced,
His hue mistaken; what of that ? or else,
Rightly traced and well ordered; what of that ?
Speak as they please, what does the mountain care ?
Ah, but a man's reach should exceed his grasp,
Or what's a heaven for ?...........

Robert Browning