In the power and splendor of the universe, inspiration waits for the millions to come. Man has only to strive for it. Poems greater than the Iliad, plays greater than Macbeth, stories more engaging than Don Quixote await their seeker and finder.
I think what gets you through a small writing project, is just one burst of inspiration. A book, especially a longer book, it's a different kind of force that pushes you through it. It's a vision of the whole thing.
Alexander, Charlemagne and myself all tried to found an empire on force and we failed. Jesus Christ is building an empire on love, and today there are millions of people who would gladly die for His sake.