"Heaven and earth shall pass away" means that they will not continue to exist as separate states. My word, which is the resurrection and the life, shall not pass away because life is eternal. You are the work of God, and His work is wholly lovable and wholly loving. This is how a man must think of himself in his heart, because this is what he is.
Whenever you experience God's reassurances as threat, it is always because you are defending misplaced or misdirected loyalty.
The Bible repeatedly states that you should praise God. This hardly means that you should tell Him how wonderful He is.