To repent means to stop sinning immediately, and to turn away from the way that you used to live, to go after Jesus and live in obedience to Him. If people keep on sinning they have not repented. After repentance follows sanctification. The moment that you repent and accept Jesus Christ you immediately stop sinning and you do not go back to that sin. If you go back to that sin you did not repent. If you go back to following after your own desires then you have not repented.
After repentance follows sanctification. If you follow Jesus Christ the Holy Spirit will convict you of things in your life that are not pleasing to Him, and as He convicts you, you immediately get rid of those things, you stop doing those things, but there is an immediate change an immediate turn away from sin and unrighteousness if you repent and follow Jesus Christ.
Many false teachers and false Christians have never repented and they justify the sin by various scripture verses, but these people are not born again, and if they were born again they have turned away from Jesus Christ, they are not following Him. We read about these people in a 2 Peter 2 The Apostle Peter writes in 2 Peter 2 verse 24:”If after they have escaped the defilements of the world by the knowledge of the Lord and Savior Jesus Christ, they are again entangled in them and overcome, the last state has become worse for them than the first. For it would be better for them not to have known the way of righteousness, than having known it, to turn away from the holy commandment handed down to them. It has happened to them according to the true proverb: A dog returns to its own vomit and a sow after washing returns to wallowing in the mire.” If we return to sin then we are like a dog and those back and eats his own vomit.
To follow Jesus Christ requires repentance. You need to immediately stop sinning. You need to immediately break with those things that prevent you from following Him and you must become holy, through your relationship with Him because you seek to please Him. But if you go back to sin you are like a pig that has been washed and has gone back to roll in the mud and the muck and the feces; you are like a dog that goes back to his own vomit and eats it. That is how these sinning Christians are. They have never repented. They are sinners. If you sin, you are of the devil. If you follow Jesus Christ you do not sin, you avoid sin at all cost and you clean up your life, you live a life that is sanctified, dedicated to Jesus Christ.
There is no such thing as a sinning Christian. All sinners will end up in hell. Repent, die to sin, stop sinning, be baptized in water, for the washing off of your sin, and sin no more. Then follow Jesus Christ and He will guide you into sanctification, into becoming more and more like Him, every day. But if you turn away from Jesus and go back to your sin, then you are like the dog that has gone back to his own vomit.
May Jesus bless you.