The Apostle John wrote, ‘Whoever does not practise righteousness is not of God’ (1John 3:10). It is usual for children to resemble their parents. If a child is born who bears no similarity whatever to its father, eyebrows tend to be raised, suspicions aroused and searching questions asked. So if God is righteous, is it not somewhat surprising if He has given new life to children who retain constant sin in their lives? May we not be a little suspicious of those who claim to be Christians but whose day-to-day existence is marked by carnality and self-indulgence? Now God forbid that anyone should think that I am speaking of sinless perfection here; if there is a reader thinking to himself, “Well, amen to all this! I agree with it so much that I no longer sin at all!” Then he’s fooling himself. John himself wrote, ‘If we say we have no sin, we deceive ourselves, and the truth is not in us’ (1John 1:8), whilst James tells us that, ‘We all stumble in many ways’ (James 3:2). What we are talking about here is a true longing for holiness; a desire to be like our Lord. We cannot lay hold of Heaven while our hands are still full of our sins. Therefore the true Christian joyfully lays down all his sins at the foot of the cross and declares with the Psalmist, ‘I delight to do Your will, O my God, and Your law is within my heart’ (Psalm 40:8). That is why it is not possible for a practising thief, liar, adulterer or homosexual to be a Christian, whatever they may declare. Anyone who says to himself, “I want to become a Christian, but I won’t stop doing that…”, whatever “that” may be, is on the broad road to destruction (Matt. 7:13). We are told of Levi, the tax collector that he, ‘left all, rose up and followed [Jesus]’ (Luke 5:28). We may or may not be called to leave our jobs or our families when we become Christians, but we are certainly called to leave our sins (John 8:11) even if they are as dear to us as our right hands or right eyes (Matt. 5:29). Alas, perfect sinlessness will still elude us, but when we confess our sins, God looks into our hearts, sees our sincerity and forgives us for Christ’s sake. ‘My little children, these things I write to you, that you may not sin. And if anyone sins, we have an advocate with the Father, Jesus Christ, the Righteous’ (1John 2:1).
Taken from my blog series on the New Birth. Read more here. https://marprelate.wordpress.com/2010/08/29/new-birth-9-evidences-of-the-new-birth/
Mormons and Jehovah Witnesses believe they follow these scriptures as well. Does this prove to themselves they are saved?