If God is unchanging, we have nothing to contribute, we can neither please him or disappoint him. What need or want would he have for us?
There's no way we can "please" or "disappoint" Him, because He already knows who we are, and knows what we are thinking even before we do.
He knows who and what we are "in our hearts," from first to last.
He does not need any "contribution" from us to be Who He IS.
As to "What need or want would he have for us?" — He wants relationship with His sons, who He made out of love, for love.
This is my understanding.