God Is Not All-Forgiving

There are some people whoses sins God does not forgive.
Wrote Paul: " If we practice sin willfully after haveing recieved the accurate knowledge of the truth,
there is no longer any sacrifice for sins left,
but there is a certain fearfull expectation of [condemnatory] judgement."
{Hebrew 10:26,27}

The words "practice sin willfully" suggest deeply ingrained badness, a truely wicked heart.