The most solemn warning.
When believers deliberately return to the spiritual immaturity, they would experience, often unnoticeably, the spiritual deterioration. If they persist in such a condition, they will place themselves beyond the reach by the Holy Spirit. The mind of a believer, who is in such a state, could neither hear nor recognize the guidance given by the indwelling Holy Spirit. The Holy Spirit would then be grieved, and could no longer reside in the believer. Therefore, the author of the Hebrews issues a most solemn warning. “For it is impossible for those who were once enlightened, and have tasted the heavenly gift, and have become partakers of the Holy Spirit, and have tasted the good word of God and the power of the ages to come, if they fall away, to renew them again to repentance, since they crucify again for themselves the Son of God, and put Him to an open shame.”. Hebrews 6:4 – 6, NKJV.
The author of the Epistle to the Hebrews echoes the words of Jesus: “’When an unclean spirit goes out of a man, he goes through dry places, seeking rest, and finds none. Then he says’, ‘I will return to my house from which I came,’ ‘And when he comes, he finds it empty, swept, and put in order. Then he goes and takes with him seven other spirits more wicked than himself, and they enter and dwell there, and the last state of that man is worst then the first. So shall it also be with this wicked generation.” Mathew 12:43 – 45, NKJV.
Either we are justified and saved through Grace, the faithfulness of Jesus, or not saved at all. Concerning our salvation, there is no negotiation and compromise. We could never achieve common ground between our ways and the justification by the faithfulness of Jesus. There is no alternative. The “once been enlightened” means to know and be convinced who Jesus is, and why the Christ. The “tasted the heavenly gift” means have experienced the justification by the faithfulness of Jesus.
The author of the Hebrews did not write this warning to some pseudo-believers, but to the yielded believers who allowed the Holy Spirit to lead them into the personal experience of the justification by the faithfulness of Jesus. If the believers were to deviate from the truth as it is in Jesus Christ and inject their “I” into the workings of salvation, they could never return to the grace again. When we clean our mind from all that is contrary to the will of God we, then, must let Jesus Christ dwell in our mind continually. If not, the devil will undoubtedly take advantage of the unfortunate state, come in and rejoice.