I've seen the theme of divine humility mentioned in several of C.S. Lewis' works, but never spelled out so clearly as in The Problem of Pain:
It is a poor thing to strike our colors to God when the ship is going down under us; a poor thing to come to Him as a last resort, to offer up "our own" when it is no longer worth keeping. If God were proud He would hardly have us on such terms: but He is not proud, He stoops to conquer, He will have us even though we have shown that we prefer everything else to Him, and come to Him because there is "nothing better" now to be had. The same humility is shown by all those divine appeals to our fears which trouble high-minded readers of scripture. It is hardly complimentary to God that we should choose Him as an alternative to Hell: yet even this He accepts. (p. 97)
Astonishing, to say the least!