Will power or inspiration?

Alan Bennett writing about Auden and Benjamin Britten in his play "The Habit of Art" discusses what this habit means - "the need to sit down and work every day, even the muse has gone walkabout". Bennett says that will power is more important than talent:
"Talent you can dispense with, but not will. Will is paramount, not joy, not delight, but grim application. Without grim application you get nowhere, but one would like to think one has more than that"

Comforting words. But I don't think there is anything wrong with like some joy and delight as well!