1 John 3:7-9 8[But] he who commits sin [who practices evildoing] is of the devil [takes his character from the evil one], for the devil has sinned (violated the divine law) from the beginning. The reason the Son of God was made manifest (visible) was to undo (destroy, loosen, and dissolve) the works the devil [has done]. 9No one born (begotten) of God [deliberately, knowingly, and habitually] practices sin, for God’s nature abides in him [His principle of life, the divine sperm, remains permanently within him]; and he cannot practice sinning because he is born (begotten) of God. 10By this it is made clear who take their nature from God and are His children and who take their nature from the devil and are his children: no one who does not practice righteousness [who does not conform to God’s will in purpose, thought, and action] is of God; neither is anyone who does not love his brother (his fellow believer in Christ).
This passage is very sobering. The first part says if we commit sin we are of the devil. That’s kind of scary, because all of us commit sin. If we dig a little deeper it says he who practices evildoing. To practice something means it is done on a regularly basis as an established custom or habit. If there are things in our life that are contrary to the Word of God that we deliberately, knowingly and habitually do we are in sin. Remember what it says in 1 John 1:5-6 5And this is the message [the message of promise] which we have heard from Him and now are reporting to you: God is Light, and there is no darkness in Him at all [no, not in any way]. 6[So] if we say we are partakers together and enjoy fellowship with Him when we live and move and are walking about in darkness, we are [both] speaking falsely and do not live and practice the Truth [which the Gospel presents]. We cannot say we are of God yet continue to purposefully live in sin. No matter how much we may want to justify or make excuses for the way we live our lives, the Word show us it’s very plain. It’s black or white, we’re either in sin or not, of God or the devil.
Now before you get down on yourself, look at the next part of the verse- The reason the Son of God was made manifest (visible) was to undo (destroy, loosen, and dissolve) the works the devil [has done]. Jesus came to destroy the works of the devil. If there are areas in our life that we are walking in sin, we have a way of escape. When we ask Him to forgive us and cleanse our hearts he does. Psalm 103:11-12 tells us 11For as the heavens are high above the earth, so great are His mercy and loving-kindness toward those who reverently and worshipfully fear Him. 12As far as the east is from the west, so far has He removed our transgressions from us. Hebrews 8:12 says 12For I will be merciful and gracious toward their sins and I will remember their deeds of unrighteousness no more. He will always forgive us, but we in turn have to reverence and fear Him. When we put His Word above our desires we will walk according to His instruction and will conform to His image, putting us in position to receive His mercy and grace in our lives.