Wow, you are fast in pointing it out (I guess you might have thought of it) I alluded that in "Of course, there is the matter of the reward of the kingdom / dispensational punishments in the 1000 years millennium, this has nothing do with salvation and going to hell." It is a large subject.
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Saved but Not Receiving the Kingdom Reward
In the New Testament, from Matthew to Revelation, there is a line of thought concerning reward, and we would do well to pay attention to it. In Matthew 5 and 6 the Lord Jesus speaks repeatedly concerning reward (5:12, 46; 6:1-2, 5, 16). In 1 Corinthians 3:8 Paul says, “Each will receive his own reward according to his own labor.” Then in verse 14 he goes on to say, “If anyone’s work which he has built upon the foundation remains, he will receive a reward.” In Revelation 22:12 the Lord Jesus says, “Behold, I come quickly, and My reward is with Me to render to each one as his work is.”
There is a great difference between salvation and reward. “For by grace you have been saved through faith, and this not of yourselves; it is the gift of God; not of works that no one should boast” (Eph. 2:8-9). This clearly and emphatically reveals that eternal salvation is altogether by grace through faith, having nothing to do with our works. Nothing that we have done, are doing, or will do can affect our eternal salvation (a gift) which is absolutely a matter of God’s grace (a gift) through our faith (a gift) in the Lord Jesus. God has imparted to us the ability to believe in the Lord Jesus, and by believing we are saved and have life inHis name (Acts 16:31; John 20:31).
Once we have been saved, we cannot be lost; that is, we cannot suffer eternal perdition. Those who have been saved by grace through faith will never perish (John 10:28-29). Our eternal salvation is forever secured by the will of God, by the selection and calling of God, by the love and grace of God, by the righteousness of God, by the covenant of God, by the power of God, by the life of God, by God Himself, by the redemption of Christ, by the power of Christ, and by the promise of Christ. We have been born of God, and we cannot be unborn. By faith we have been joined to the Lord to become one spirit with Him in a marvelous organic union. This joining and union are eternally secure in the divine life. Regarding eternal salvation in relation to the kingdom re- ward, we must avoid extreme theological views. One extreme view insists that we are saved eternally and that we can lose neither our salvation nor the kingdom reward. The other extreme view claims that salvation is conditional upon good behavior and that we can lose both our salvation and the kingdom reward. The truth in the Bible is balanced: eternal salvation is by grace through faith, and it cannot be lost; the kingdom reward involves righteousness and works, and it can be forfeited.
A Reward according to Our Works
Hebrews 10:35 says, “Do not cast away therefore your boldness, which has great reward.” This reward is the kingdom reward, which is something in addition to eternal salvation. Whereas eternal salvation is by grace through faith, having nothing to do with our works, the kingdom reward is given for our work as believers in Christ. According to 1 Corinthians 3:8 we will be re-warded according to our labor, for the Lord will give to us according to our work (Rev. 22:12). Although we are saved, we may not receive the kingdom reward because we are devoid of the work which the Lord can approve (1 Cor. 3:15; Matt. 7:21-23). If we do not labor by the Lord’s all-sufficient grace to carry out His economy (1 Cor. 15:10; 2 Cor. 12:9) and if our work does not remain after it has been tried by fire, we will not receive the reward of the kingdom. It is contrary to the Scriptures to teach that all believers will receive the kingdom reward no matter how they live and work after they are saved. The basic truth concerning the kingdom reward is this— receiving the kingdom reward is not a matter of God’s saving grace but of our subsequent work. If we are faithful servants in this age, we will enjoy the kingdom with the Lord in the coming age (Matt. 25:21, 23). If we are not faithful, we will suffer loss and undergo some kind of dispensational punishment (v. 30).
The kingdom reward will be decided at the judgment seat of Christ (2 Cor. 5:10), where the Lord will “bring to light the hidden things of darkness and make manifest the counsels of the hearts” (1 Cor. 4:5). At His coming back, the Lord Jesus will set up His judgment seat and judge all the believers with respect to their life and work. There, at the judgment seat, the decision will be made regarding the kingdom reward, with the Lord, the righteous Judge, determining who will receive the kingdom reward (2 Tim. 4:8). Those who receive this reward will enter into the joy of the Lord and reign with Him as His co-kings, sitting with Him on His throne. This will be the fulfillment of the Lord’s promise in Revelation 3:21: “He who overcomes, to him I will give to sit with Me on My throne, as I also overcame and sat with My Father on His throne.”
Moses looked away to the kingdom reward (Heb. 11:26) and Paul endeavored to obtain it (1 Cor. 9:24-27). Throughout the course of his Christian life, Paul was running the race for the kingdom reward, not having the assurance that he had laid hold of this reward. Only at the end of his life, immediately before his martyrdom, did he know for certain that the crown of righteousness had been prepared for him and for all who love the Lord’s appearing (2 Tim. 4:7-8). With Paul as our pattern (1 Tim. 1:16), we should run the race set before us, not trusting in ourselves or assuming that all is well simply because we are saved. We may receive the kingdom reward or we may not. For all of us, this matter is pending the Lord’s decision at His judgment seat. The Lord’s word concerning the kingdom reward is serious and weighty. It is truly a word of righteousness...
This balanced understanding solves both extreme views: Calvinism vs Arminism. It will help you now to understand passages especially in Matthew 24 and 25, other portions of Matthews and Hebrews. (Your question) Weeping indicates regret, and gnashing of teeth indicates self blame.
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If we cooperate with God's supplying grace, we will mature in life in the church age, and this earlier maturity in life will constitute a prize with which the Lord will reward us at His coming back. However, those who do not mature in life in the church age will not be ready at the Lord's coming back to enter into the millennial kingdom and share in the divine blessings of that age as a prize. Therefore, during the millennial kingdom their names will be erased from the book of life. After being disciplined by the Lord and growing in life unto maturity during the millennial kingdom, they will share in the divine blessings in the stage of eternity. They did not cooperate with the Lord in the church age, will be dispensationally disciplined by the Lord during the millennial kingdom and will miss the divine blessings in that stage. However, the names of those who have lived an overcoming life in the church age will remain in the book of life during the coming age of the kingdom.
To participate in the coming kingdom is also to gain our soul, to save our soul, and to enjoy the salvation of our soul. If today we love only the Lord and not our soul, that is, our self, and if we live by Him and according to His standard, then when He comes back He will reward us with the kingdom. In the kingdom we shall have no problems, sorrows, or sufferings in our soul, for at that time we shall gain our soul, we shall save our soul, and we shall enjoy the salvation of our soul. However, if we are defeated believers, we shall be punished during the kingdom age, and that punishment will involve our soul, with the gnashing of teeth as a sign of suffering in our soul. (Matthew 16).
The question: will you be gained by the Lord in these 70-80 years or be perfected during the 1000 years? .... The good news, all will be matured as the New Jerusalem after the millennium.

Yes, I have already thought of that, as I said, I have many many questions on my mind, and that's why you can see me replying your comments right away.
1. If hell isn't for christian who has already attained salvation, does it mean what Ps. Philip Mantofa said in his testimony - seeing religious christian in the hell, is a lie? Or an illusion only?
2. If that "Luke 13:28 - weeping and gnashing of teeth" is only indicating self blame, then
And again, if it's works that determine human's destination, it simply means salvation is not by grace, but by works.