Erin Kellison said this quote

“ The trouble with being an angel on Earth was that he was still a man. He got hungry. He thirsted. His lungs clamored without the draw of air. And for this woman, the only one in a thousand years, his body and soul ached. The trick was to will his mind, and ignore the Earthly sensations, as he'd done so many times with pain and trouble. Desire was no different, a call of the flesh. He could divide himself-acknowledge the lust and act on intellect. But see, the trouble with being an angel was that he was still a man. ”