In Christ, we have everlasting righteousness

Believers, in Christ, we are not righteous until our next sin. In Him we don't become unrighteous or "lose our salvation" because we sinned, much like how a child does not stop being the child of his father because he was disobedient. Christ offered one sacrifice for sins forever. In Him, our sins, past, present and future have been righteously put away forever. See Hebrews 10:

11 "And every priest stands ministering daily and offering repeatedly the same sacrifices, which can never take away sins. 12 But this Man, after He had offered one sacrifice for sins forever, sat down at the right hand of God, 13 from that time waiting till His enemies are made His footstool. 14 For by one offering He has perfected forever those who are being sanctified."

One sacrifice for sins forever.

As the righteousness of God in Christ (See 2 Cor. 5:21,) we are everlastingly righteous and irrevocably saved in Him. We didn't/can't ever work for or earn this righteousness (the only brand that makes the cut with God) so our sins and mistakes cannot make us lose it. Rather, with God's gift of righteousness comes no condemnation for all who are in Christ (Romans 8:1) and it is Christ's "Neither do I condemn you" that makes us "go and sin no more." This is the logic of heaven.

God's gift of righteousness to all who truly believe in Christ as Saviour to the uttermost is an everlasting righteousness. The child who believes that his receiving and retaining "the Spirit of sonship by whom we cry, "Abba, Father" is hinged on his own ability to live a sinless life by keeping the Law has been cut off from Christ. Galatians 5:4 says "For if you are trying to make yourselves right with God by keeping the law, you have been cut off from Christ! You have fallen away from God’s grace."

Romans 5:19 says "For as by one man’s disobedience many were made sinners, so also by one Man’s obedience many will be made righteous."

Here, we see that acts of sin is not what makes people sinners. People are made sinners because of Adam's sin. Likewise, acts of (self) righteousness aka law-keeping and doing good works cannot make anyone righteous. All who truly believe are made righteous by Christ's obedience.

Some seem to think that God will "consider them" because their sins are not "big" like those of fornicators, homosexuals, murderers and child molesters. Not so. For all who try to keep the Law in order to be right with God or receive from Him, stumbling at one point makes one guilty of breaking all (see James 2:10.) For those who think that God blesses them because of their ability to keep the Law and do "good things," the one who only lied about his location is as guilty as the child-molesting rapist murdering ritual killer.

Sinners (who were made sinners by Adam's disobedience) do good things sometimes but that does not make them lose their sinner status. Likewise, the righteous (by Christ's obedience) fall sometimes but that does not make us lose our righteousness in Him. Plus the righteous in Christ do not continue in that sin and not through self-effort. It is by the Holy Spirit transforming us to the image of the glory of the Lord, from glory to glory (1 Corinthians 3:18)

One can live his life in a bubble of "righteousness of self" from obeying the Law and do good works in order to please God but without wholly forsaking the self-righteousness which comes from obeying the Law and receiving the righteousness that comes from Christ's obedience, that one is still a sinner and not saved, even though he professes to know Christ. Romans 3:20 "For no one can ever be made right with God by doing what the law commands. The law simply shows us how sinful we are."

Believers, we are made righteous by believing Christ - believing that He paid the wages of ALL of our sins, past, present and future, so that we might have the gift of God - eternal life in Christ Jesus our Lord. In Him, God remembers our sins no more. See our New Covenant blessings in Hebrews 8/10.

Bear in mind that there are unbelieving believers aka those who profess Christ and call Him "Lord, Lord" but do not believe His finished work; Believers, by His grace, let's not be found here: trying to keep the Law to get right with God thus rejecting God's gift of everlasting righteousness that Christ died that we might have.

If our salvation depended on us by a hair's breadth, no one would be saved. "The arm of flesh will fail." Our Abba Father saw how hopelessly doomed we were so He gave His Son to die for our sins, because He loved us so. In Christ, having received the abundance of grace and of the gift of righteousness, we are hopelessly and irrevocably saved! He leads us on the path of righteousness.

The Holy Spirit will teach you all things.

Believe Right and you will Live Right.