Here is a good reminder from God’s word:
See what kind of love the Father has given to us, that we should be called children of God; and so we are. The reason why the world does not know us is that it did not know him. Beloved, we are God’s children now, and what we will be has not yet appeared; but we know that when he appears we shall be like him, because we shall see him as he is.
And everyone who thus hopes in him purifies himself as he is pure. Everyone who makes a practice of sinning also practices lawlessness; sin is lawlessness. You know that he appeared to take away sins, and in him there is no sin. No one who abides in him keeps on sinning; no one who keeps on sinning has either seen him or known him. Little children, let no one deceive you. Whoever practices righteousness is righteous, as he is righteous. Whoever makes a practice of sinning is of the devil, for the devil has been sinning from the beginning. The reason the Son of God appeared was to destroy the works of the devil. No one born of God makes a practice of sinning, for God’s seed abides in him, and he cannot keep on sinning because he has been born of God. By this it is evident who are the children of God, and who are the children of the devil: whoever does not practice righteousness is not of God, nor is the one who does not love his brother. (1 John 3:1-10 ESV)
Do not despair when you fall into sin! Confess your sin to God, make things right with those you’ve offended, receive God’s forgiveness, and get right back in the battle.
However, if you live in sin, without really trying to get out or change, you’d better take a hard look at your heart, and decide if you’re really going to follow God.
Practice righteousness! Work out your salvation in fear and trembling – not working to earn your salvation, but once saved you have a lifetime of working toward sanctification, of becoming more like Christ.
Keep the faith!