I think the problem with the idea of eternity is that we do not have any direct experience of it, but we encounter enough of its possibility to be unsettling.
The promise here is that God is present with us in our troubles, issuing commands to save us before we ask. God does not ignore our suffering and cries.
To the extent that God is exclusive by offering salvation only through Christ we can say he is more gracious than other systems because he takes on our guilt upon himself while gifting us his righteousness.
God is coloring over your sin and making you fragrant; he is making you righteous in his sight. The old is gone, forever covered over by this new work.
What I have come to see is that while anyone can make a conscious decision to walk away from God or deny him, a person can’t accidentally lose his or her salvation.
If the gospel is promise that means it is essentially relational. It stands that the nature of any promise is that it's only as good as the one who issues it.