it is impossible to bring back to repentance those who were once enlightened ...
and who then turn away from God. [Hebrews 6:4,6 NLT]
This is one of the most difficult and controversial passages in the New Testament. Many theologians have wrestled with it and disagree with the interpretation and application of it.
In my view the passage should be interpreted in light of the previous chapters that speak about the Israeli exodus from Egypt. People in that era are similar to ones in the church today.
The issue is basically the difference between repenting with your mind and your heart. Many today mentally assent to Christian beliefs yet have never had a transformation of their heart.
These appear to be believers. They often talk the talk and walk the walk. Yet these have never known God at a heart level. Consequentially they fall away as those in the wilderness did.
Thank you Lord that what is impossible with us is possible with you.
... this devotion is part of a series from the book of Hebrews.