The closest I can get to it, is a line from The Magician's Nephew:
“Wouldn't he know without being asked?' said Polly.
'I've no doubt he would,' said the Horse (still with his mouth full). 'But I've a sort of an idea he likes to be asked.”
Well, it IS true, since Scripture says so, right?
Though what I tend to do is to ask the Spirit to pray for anything that I don’t know that I need, and after that, just trust that the Lord will do what is right.
(Incidentally, that’s one of my favorite books.)