Well, I can certainly understand what you mean by that. I don’t really think it’s correct, but I understand the logic.
The reason I don’t think that trying to talk to dead believers is necessary is because the Lord has already promised that the Holy Spirit also prays (or intercedes if you want another translation) for us, and prays things that even we don’t know we need to pray for:
“Likewise the Spirit helps us in our weakness. For we do not know what to pray for as we ought, but the Spirit himself intercedes for us with groanings too deep for words.” (Romans 8:26)
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.”