Jesus revealed that for those whom He does not know, they will experience this at the Judgment and beyond,
“There will be weeping and gnashing of teeth, when you see Abraham and Isaac and Jacob and all the prophets in the kingdom of God, and yourselves thrust out” (Luke 13:28).
Picture that in your mind, for that is what Jesus wants us to do. The utter horror of seeing the patriarchs and the prophets in the kingdom of God, in heaven itself, but to see one’s self thrust out has to be the ultimate horror.
Let us all seek to know the Lord that He might know us, and that way we shall never experience such a horror.