Obviously, we have it even in the epistle of Paul to the Galatians (5:19-21) that if we walk according to the works of the flesh, we will not inherit the kingdom of God...and the only alternative to inheriting the kingdom of God is suffering eternally in the kingdom of hell.
Therefore, if you are going to escape hell and enter into the kingdom of heaven, you must repent of working the works of the flesh...you must cease from operating in them. Because if you don't, you will be working the works of the flesh and will not inherit the kingdom of heaven as the result...and that means burning in hell for ever and ever.
Not something that I would want to take a chance on...
When Jesus saves us, He does not only save us from the penalty of sin...He also saves us from its practice and power (Matthew 1:21, Titus 2:14).
The blood of Jesus is most certainly adequate to save us...
However, it does not only justify us (as per Romans 5:9)...it also sanctifies us (Hebrews 13:12, Hebrews 10:29) and cleanses us from all sin (11 John 1:7).
So, can it be applied and not perform all of its functions?
If it has sanctified and cleansed you from all sin, you can be certain that it has also justified you.
Therefore if it has justified you, will it not also sanctify and cleanse you at the moment of justification?
Can it perform one of its functions (justify) and not also perform its others (to sanctify and cleanse)?
I will say that God does not perform the work of sanctification in a man against his will (for Jesus and the Holy Spirit are a gentleman); therefore the Lord requires repentance if He is going to do all three works that are provided by His blood.
Now we do not obtain this salvation by attempting to change our behaviour but by faith. We do not obtain it by attempting to obey a set of do's and don'ts; as though obeying the law could save us.
But we obtain this salvation by placing our faith in Christ as the remedy for our sinful behaviour; and He comes in and changes us from the inside out; so that, now that we have the Spirit and also walk according to the Spirit, the righteousness of the law is (practically) fulfilled in us (Romans 8:4).
Romans 7:6 is key to our understanding in this.
For in Galatians 6:13, it becomes clear that no one can keep the letter of the law.
So then, as we are delivered from the law and its condemnation, we are set free to walk not after the oldness of the letter but after the newness of the spirit.
If Jesus has saved you then He has saved you from sin (Matthew 1:21, Titus 2:14); which is the transgression of the law (Romans 3:20, 1 John 3:4).
So then, those who have been redeemed by Christ will become law-abiding citizens of the kingdom.
In Galatians 5:22-23 this becomes abundantly clear. If we bear the fruit of the Spirit, there is no law that will condemn us in our behaviour.
Thus, it is a righteousness apart from the law (for we receive the Spirit through faith in Jesus Christ) that is nevertheless attested to by the law and the prophets that it is righteousness indeed (Romans 3:21). The law testifies to the fact that the righteousness of faith is the righteousness of God.
Most definitely, we are not justified by the works of the law (Romans 3:20, Galatians 2:16). However, when we are born again, we are regenerated and renewed on the inside and the result will be obedience to God's word. Therefore we are justified unto obeying the works of the law. Again, not through attempting to obey a set of do's and don'ts; but through bearing the fruit of the Spirit our behaviour will be the behaviour of a law-abiding citizen of the kingdom.
Also, in James 1:25, we find that if we look into the perfect law of liberty and continue therein, we will be blessed in what we do. So then, the law, for the believer in Christ, is no longer a condemning taskmaster but is rather a set of wisdom principles to live by for the sake of being blessed as we live our lives in this world.