Oscarr said in post #49:
If you are born again of the Spirit of God you cannot lose your salvation because you are covered by the righteousness of Christ.
Note that Hebrews 10:26-29 shows that truly saved people, people who have truly been sanctified by Jesus' sacrificial blood (Hebrews 10:29), which sanctification requires faith (Acts 26:18b, cf. Romans 3:25-26), can, after they get saved, wrongly employ their free will to commit sin without repentance (Hebrews 10:26). By doing this, these saved people are unwittingly trampling on Jesus and his sacrificial blood, and doing despite unto the Spirit of grace (Hebrews 10:29), turning the grace of God into lasciviousness (Jude 1:4), so that their ultimate fate will be worse than if they had never been saved at all (2 Peter 2:20-22). Even though Jesus' sacrificial blood is sufficient to forgive all sins (1 John 2:2), it actually forgives only the sins of believers which are past (Romans 3:25-26), as in sins which have been repented from and confessed to God (1 John 1:9,7). Jesus' sacrificial blood does not remit unrepentant sin (Hebrews 10:26-29). So a saved person can in the end lose his salvation if he wrongly employs his free will to commit unrepentant sin (Hebrews 10:26-29; 1 Corinthians 9:27, Luke 12:45-46).
Some Christians feel that Hebrews 10:26-29 is not for Christians. But note that the immediate context of Hebrews 10:26-29 is Hebrews 10:25, which is addressing "we" saved people. Hebrews 10:25-29 is the same idea as Hebrews 3:13: Saved people need to gather together and exhort each other so that no saved person will fall into any unrepentant sin. For any unrepentant sin will ultimately result in the loss of salvation (Hebrews 10:26-29; 1 Corinthians 9:27, Luke 12:45-46, Matthew 7:22-23, Galatians 5:19-21; 2 Peter 2:20-22, Romans 8:13; 1 John 5:16, James 5:19-20).
One way that a saved person could come to desire to commit sin without repentance would be if he finds a particular sin to be very pleasurable, so pleasurable and so fulfilling (in the short term) that he continues in it over time until his heart becomes hardened by the deceitfulness of sin (Hebrews 3:13), to where his love for God grows cold because of the abundance of iniquity (Matthew 24:12), to where he quenches the Spirit (1 Thessalonians 5:19), to where he sears his conscience as with a hot iron (1 Timothy 4:2), to where he becomes so infatuated with his sin that he can no longer endure the sound doctrine of the Bible (such as the doctrine of Hebrews 10:26-29), but instead latches onto a mistaken, man-made teaching which contradicts the Bible (2 Timothy 4:3-4), such as the mistaken teaching which assures believers that there is no way that they can ever lose their salvation, even if they sin without repentance.
*******
Oscarr said in post #51:
Jesus is our ultimate judge, and the wonderful thing is that our Judge is also our defence lawyer.
Note that some saved people, at the judgment of the church by Jesus (2 Corinthians 5:10, Romans 2:6-8, Luke 12:45-48, Matthew 25:19-30), at his second coming (Psalms 50:3-5, cf. Mark 13:27), will lose their salvation because of such things as unrepentant sin (Luke 12:45-46, Hebrews 10:26-29; 1 Corinthians 9:27), unrepentant laziness (Matthew 25:26,30, John 15:2a, Romans 2:6-8), or apostasy (Mark 8:35-38, Hebrews 6:4-8; 2 Timothy 2:12b). That's why saved people know the "terror" of the coming judgment of the church by Jesus (2 Corinthians 5:10-11), why they must remain in fear of being cut off the same as unbelievers if they don't continue in God's goodness (Romans 11:20-22, Luke 12:45-46), why they must be careful to work out their own ultimate salvation with fear and trembling (Philippians 2:12b; 1 Peter 1:17, Romans 2:6-8).
*******
Oscarr said in post #59:
If one party breaks the commitment, the covenant no longer exists.
Similar to what PeterDona pointed out, this brings to mind Jeremiah 3:8, which refers to God divorcing Israel for adultery during Old Covenant times. Under the New Covenant, men aren't allowed by God to divorce their wives for adultery, but only for pre-marital fornication (Matthew 19:9) not discovered until after their wedding. Also, even after God divorced Israel, he said that he was still married to Israel and wanted Israel to return to him (Jeremiah 3:14). It's the same under the New Covenant: a woman divorced from a valid husband is still married to him in God's eyes. That's why if she marries another man, she's committing adultery against her valid husband (Mark 10:12), and her new husband is committing adultery against him (Luke 16:18b). The only choices for a woman divorced from a valid husband are to remain unmarried or to remarry her valid husband (1 Corinthians 7:11), just as divorced Israel will eventually remarry God (Hosea 2:19-20, Isaiah 54:5-10, Isaiah 62:5b).
Oscarr said in post #59:
If one party breaks the commitment, the covenant no longer exists.
This also brings to mind Jeremiah 31:32. This verse saying that God "was" Israel's husband is like a man saying to his daughter: "You left me even though I was your father". This doesn't contradict him still considering himself to be her father. For even if the father had legally disowned the daughter after she left him while still a minor to go live with some other family that ended up legally adopting her, this doesn't contradict him still considering himself to be her biological father. For there's no breaking that connection. In the same way, even after God legally divorced Israel after she abandoned him to worship other things, this doesn't contradict him still considering himself to be her husband (Jeremiah 3:14), for there's no breaking that connection entirely in God's eyes (Mark 10:8-12).
Also, Jeremiah 31:32 saying that God "was" Israel's husband doesn't contradict that God still wants Israel to return to him (Jeremiah 3:14), just as it doesn't contradict that he has made the New Covenant with Israel (Jeremiah 31:31-37, Matthew 26:28; 1 Corinthians 11:25). In the father/daughter analogy, it would be like the father sending letters to his estranged daughter asking her to come back to him, and him writing up a legal document which if she signed would make her legally his daughter again.