Because Hebrews 6:4-6 specifically says its IMPOSSIBLE to renew them again to repentance? So why all this talk for example about David losing his salvation, then REPENTING and getting it back? Which would go against Hebrews 6:4-6.
If a person is saved, and they sin, they can be forgiven of that sin, and move forward in the Spirit.
Even if a person holds unto sin for a year, and they repent of it not wanting it anymore, and mean it, they can be forgiven, and move forward in the Spirit.
Hebrews 6:4-6 is different than someone that sins, and can be forgiven, but it is a graver mistake.
2Pe 2:20 For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning.
2Pe 2:21 For it had been better for them not to have known the way of righteousness, than, after they have known it, to turn from the holy commandment delivered unto them.
2Pe 2:22 But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire.
These people were saved, but they went back to enjoying sins, but they can be forgiven of these sins, and move forward in the Spirit, if they repent of it, and mean it.
These people did not fall away, and they still believed the Bible, and confessed Jesus as Lord and Savior, believing the Gospel of Christ in the truth, but went back to enjoying sins after they were saved, but they can be forgiven, and a solution out of this situation.
Heb 6:1 Therefore leaving the principles of the doctrine of Christ, let us go on unto perfection; not laying again the foundation of repentance from dead works, and of faith toward God,
Heb 6:2 Of the doctrine of baptisms, and of laying on of hands, and of resurrection of the dead, and of eternal judgment.
When we are saved, going through the process that saved us, we move unto perfection, and not repeat the process of what saved us, and the essential doctrines of Christ, but go on to be perfected in the Spirit acting Christlike, and love.
Heb 6:4 For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost,
Heb 6:5 And have tasted the good word of God, and the powers of the world to come,
Heb 6:6 If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.
This is different than people that believe the Gospel, and sin, which they can be forgiven, but these people fell away, which means they stopped believing that Jesus is Lord and Savior by whatever belief they started believing contrary to the truth of Jesus and the Gospel.
The people in 2 Peter did not fall away, and a solution out of the situation, but these people fell away, and impossible to restore them.
1Ti 4:1 Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils;
1Ti 4:2 Speaking lies in hypocrisy; having their conscience seared with a hot iron;
1Ti 4:3 Forbidding to marry, and commanding to abstain from meats, which God hath created to be received with thanksgiving of them which believe and know the truth.
1Ti 4:4 For every creature of God is good, and nothing to be refused, if it be received with thanksgiving:
1Ti 4:5 For it is sanctified by the word of God and prayer.
God warns the saints of the new age movement, and their false interpretation of the Bible based on the occult, and evolution, and believe people can still evolve to be greater, and spiritual, and Jesus is not Lord and Savior, but a good teacher in the evolutionary process, and love, but not the final teacher, and do not acknowledge a personal God, but honor the God of forces, or the power of nature as their higher power, and the New Age Christ is the final teacher in the evolutionary process.
The Bible says many people shall depart from the faith, and follow the new age movement, and their false interpretation of the Bible, and stopped believing Jesus is Lord and Savior, for they abandoned the Gospel in favor of the evolution lie and they will evolve to be greater, and spiritual, and not a God to give them salvation.
That is an example of falling way, and if they decide they made a mistake, and believe again that Jesus is Lord and Savior, they cannot be renewed again, for they have to go through the process of the essential doctrines of Christ, and have faith again, and repentance from dead works, and baptism, and the process of being saved again, which then they put Jesus to an open shame for abandoning Him not believing, and then believing again.
So the moral of the story is if you sin it can be forgiven, for that is not falling away, but do not ever abandon Jesus as Lord and Savior.
But of course if a person did not believe the Gospel of Christ, and believed the new age movement, and then decided by study of the Bible, or by wise words of mouth, that the new age movement was wrong in their interpretation of the Bible, and abandoned the new age movement, and believed Jesus is Lord and Savior, they can be saved for they are a sinner in need of salvation.
2Ti 4:2 Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all longsuffering and doctrine.
2Ti 4:3 For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears;
2Ti 4:4 And they shall turn away their ears from the truth, and shall be turned unto fables.
The new age movement is the future for this sinful world, and the time will come the world will only want to hear the Bible according to the new age movement, which will lead the people that do not love God to follow the New Age Christ.
2Th 2:1 Now we beseech you, brethren, by the coming of our Lord Jesus Christ, and by our gathering together unto him,
2Th 2:2 That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by word, nor by letter as from us, as that the day of Christ is at hand.
2Th 2:3 Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition;
2Th 2:4 Who opposeth and exalteth himself above all that is called God, or that is worshipped; so that he as God sitteth in the temple of God, shewing himself that he is God.
Which this is another example of falling away, which this falling away has to do with the condition of the world in response to the Gospel, which the nations come together and try to establish peace on earth, and the new age movement the unified religious system, and they stop the preaching of the Gospel of Christ on a worldwide level, for anything taught contrary to the unified religious system is illegal, and will cause the man of sin, New Age Christ, to rule over them.
So in Hebrews 6 the falling away is because they abandoned Christ, and stopped believing the Gospel, and if they believe again they cannot be renewed.
But some people will not understand how they could fall away after they believed the Gospel, but that is what the Bible says, and they should understand what the Bible actually says concerning them being right with God, and that it is possible for a person to fall away from the truth.
Hebrews 6:4-6 is not speaking of someone sinning, and cannot repent of it, but it is speaking of someone abandoning the truth of Jesus as Lord and Savior, and then believing again, which they cannot be renewed.
If we sin we can be forgiven all day long as long as we hold unto the truth of God, and Jesus.