Shall we speak of the inspiration of a poet or a priest, and not of the heart impelled by love and self-devotion to the lowliest work in the lowliest way of life?
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.
All of the actors that have served to me as inspiration over the years have been those more associated with dramatic work who have, in turn, been able to embody their characters and lose themselves in those characters that they create.
Hold to the idea, "I am not the mind, I see that I am thinking, I am watching my mind act," and each day the identification of yourself with thoughts and feelings will grow less, until at last you can entirely separate yourself from the mind and actually know it to be apart from yourself.