And I said, Oh that I had wings like a dove! for then would I fly away, and be at rest. O that I had wings like a dove! - He was so surrounded, so hemmed in on every side by his adversaries, that he could see no way for his escape unless he had wings, and could take flight. The dove is a bird of very rapid wing; and some oil them passing before his eyes at the time, might have suggested the idea expressed here.
And be at rest - Get a habitation.