In this world, there is one authority. That One who is the final authority knows all things. This is the Lord Jesus Christ. The Lord Jesus Christ is the one who knows all things because the Father has revealed all things unto him. Whatever the Lord Jesus Christ tells us is the absolute truth. We are aware when the Father introduced him to us all at the transfiguration mountain that we should hear him. There is no other person who can tell us what is the truth than the Lord Jesus Christ.
The Lord Jesus Christ himself had said to us in His words that there is no other person who had ascended up to heaven apart from the one who came down from heaven. We do know that it is only himself, the Son who came down from heaven. The words of Jesus Christ are Truth and there are life. Whatever he says is nothing but the truth.
We have read in the Bible about Elijah and Enoch whom God took away and they did not die. We have also heard from the epistles that there is a third heaven. Another instance is when Jesus Christ told us a parable about the Bossom of Abraham. We cannot say more than what we understand. The things that we know, we only know in parts.