Under the Old Covenant, an external set of rules was given as a means to control the flesh nature, though it could not do that.
Under the New Covenant, our victory over sin comes from God's grace – His forgiveness, and being joined to Jesus in His death and resurrection:
Titus 2:11-15 NKJV
(11) For the grace of God that brings salvation has appeared to all men,
(12) teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly in the present age,
(13) looking for the blessed hope and glorious appearing of our great God and Savior Jesus Christ,
(14) who gave Himself for us, that He might redeem us from every lawless deed and purify for Himself His own special people, zealous for good works.
(and Paul says to Timothy . . .)
(15) Speak these things, exhort, and rebuke with all authority. Let no one despise you.
This is an extremely important passage. Paul gives a very strong emphasis here.
Turning again to the English Standard Version:
Titus 2:11-13 ESV
(11) For the grace of God has appeared, bringing salvation for all people,
(12) training us to renounce ungodliness and worldly passions, and to live self-controlled, upright, and godly lives in the present age,
(13) waiting for our blessed hope, the appearing of the glory of our great God and Savior Jesus Christ,
God's grace, which He has revealed to us, is training us – paideuo – to train as one would a child – training us to renounce, deny ungodliness and worldly lusts, training us to live sober, righteous, godly lives, as we wait for Jesus.
This is a life-changing truth . . . so I'd like to just say that again . . .
God's grace – the forgiveness of our sins, having nailed our entire debt under the law to the cross – paid in full – trains us to deny ungodliness and worldly lust, and to live sober, righteous, and godly lives, as we wait for Jesus.
Now, this may seem counter-intuitive, but this is what the Bible teaches. Understanding that we've been forgiven by God – totally, completely, permanently, forever forgiven – God's Grace - TRAINS us to not sin.
Colossians 2:20-23 NKJV
(20) Therefore, if you died with Christ from the basic principles of the world, why, as though living in the world, do you subject yourselves to regulations--
(21) "Do not touch, do not taste, do not handle,"
(22) which all concern things which perish with the using--according to the commandments and doctrines of men?
(23) These things indeed have an appearance of wisdom in self-imposed religion, false humility, and neglect of the body, but are of no value against the indulgence of the flesh.
Trying to live under any kind of Legalism or code – the 10 commandments, and the like - seems necessary - “we have to have rules!” – seems wise – but doesn't improve your fallen nature.
These things indeed have an appearance of wisdom in self-imposed religion, false humility, and neglect of the body, but are of no value against the indulgence of the flesh.
But this is what helps. This is the Biblical remedy:
Knowing that God has completely, permanently severed you from that nature, and given you a new nature instead, a nature “which was created according to (patterned after) God, in righteousness and true holiness.” (Ephesians 4:24 NKJV)
Romans 7 teaches us that the Law empowers sin. Paul says he didn't know coveting until the Law said Don't covet, then came up all manner of covetousness.
We can construct “law” from the New Testament just the same. For instance, the Bible says neither adulterers nor drunkards nor murderers will inherit the kingdom of God.
OK – So . . . There's our new law:
Thou shalt not commit adultery (lust) . . . get drunk . . . murder (hate) . . . . BUT . . .
Trying to make your fallen nature “toe the line” by trying to bend it to any set of rules – law - will forever be an exercise in futility.
These lists of sins and behaviors were NOT given to be converted into some kind of New Covenant Law. They describe those who have not been reborn with the New Nature.
Romans 8:7 (NLT) For the sinful nature is always hostile to God. It never did obey God's laws, and it never will.
Your new nature, on the other hand, doesn't need anyone to tell it to do righteousness. That's what you were born for! This is what you do! Righteousness!
It is no longer I who live, but Christ lives in me.
Put on the new man, which was created patterned after God, in righteousness and true holiness.
If you walk according to the spirit, you will not fulfill the lusts of the flesh.
Romans 6:20-22 NKJV
(20) For when you were slaves of sin, you were free in regard to righteousness.
(21) What fruit did you have then in the things of which you are now ashamed? For the end of those things is death.
(22) But now having been set free from sin, and having become slaves of God, you have your fruit to holiness, and the end, everlasting life.
Your flesh will always – only – do evil. For the sinful nature is always hostile to God. It never did obey God's laws, and it never will.
But your new creation will always – only – do righteousness. And praise be to God, Who has forgiven those evil deeds of the flesh!
This is the liberty that God gives to us – liberty from sin, and liberty from the Law. This is the liberty we proclaim to others. The forgiveness of sins, and serving a Living God, from a living heart, not letters carved in stone.
Why do we think we need to live by Law?
We're afraid! We're afraid of what our flesh might do. If there aren't rules to tell us to do this, and don't do that, we're afraid that we won't, or will.
We still think in Old Covenant ways – that God's blessings are based on our performance, but this is failing to trust in Jesus – both to have fulfilled God's requirements on our behalf, and to be able to guide us in the way we should go.
So we set up fences – rules / laws – to keep our flesh from running amok. We're afraid that without Law, we'll just run wild. We don't believe Jesus inside of us is enough to lead us in doing what is right. That the Holy Spirit isn't capable of sanctifying us.
So we have to help, by returning to the bondage of dead works thinking that is going to lead us to righteous living.
But listen again to Paul . . .
Titus 2:11-13 ESV
(11) For the grace of God has appeared, bringing salvation for all people,
(12) training us to renounce ungodliness and worldly passions, and to live self-controlled, upright, and godly lives in the present age,
(13) waiting for our blessed hope, the appearing of the glory of our great God and Savior Jesus Christ,
Romans 6:11-14 LITV
(11) So also you count yourselves to be truly dead to sin, but alive to God in Christ Jesus our Lord.
(12) Then do not let sin reign in your mortal body, to obey it in its lusts.
(13) Neither present your members as instruments of unrighteousness to sin, but present yourselves to God as one living from the dead, and your members instruments of righteousness to God.
(14) For your sin shall not lord it over you, for you are not under Law, but under grace.
Sin's power is broken, not by subjecting it to law, but by knowing you are forgiven.
Sin's power is broken in knowing you can just walk away. Knowing it has no more authority over you. You are free to live for God.