1 John 3:6

No one who lives in him keeps on sinning. No one who continues to sin has either seen him or known him.

(v6, NIV)

If you live in him, you will not keep on sinning. These are people who abide in him. God is light and in him is no darkness. Jesus came to take away our sins, and in him is no sin. If you live in him, how can you keep on sinning? This contradicts his very nature. Why would he take away your sins so that you could just keep on sinning? You can't live in him and keep on sinning. It just doesn't make sense. If you were in him and you kept on sinning, he would no longer be without sin. Your continual growth in sin only proves that you are not living in him. You haven't even seen him or known him. Instead, live in him, and do not keep on sinning.

This doesn't mean we will not sin. Back in chapter one if you'll recall, John talks about those who say they are without sin or say that they do not sin. If you do that, you deceive yourselves and you are making God to be a liar. The fact of the matter is that we will sin. However, the question is, are you growing and continuing on your path to destruction? Does sin have a stronger hold on you and are you growing in that? Do not keep on sinning.