Do you desire to be totally pure, free of lustful thoughts and habits? You can be! God has given us some good guidance and wonderful promises in Deuteronomy 7. The chapter primarily gives guidance and promises to Israel, but they are for Christians as well—if we understand how to apply the principles.
In Deuteronomy 7 God is telling the people of Israel through Moses that when they go into the new land to occupy it they are to make no treaties with the people or intermarry with them, but they are to completely destroy all the people and destroy their pagan altars and idols. For they were His own special people whom He loved and whom He had rescued out of Egypt. For this reason they could not mix with a sinful, idolatrous people. But if they obeyed Him He would love them and bless them and make them a great nation; He would also give them many children, large crops, and protection from sickness.
Now how does this apply to us and how can we use it to become pure and holy? Well, here’s how: First of all, Christians are God’s special people just as Israel was and is (1 Pet. 2:9-10). He loves us and wants us to be holy like Him.
Secondly, just as the people of Israel were not to intermarry with the pagans in the land, and they were to destroy them and their pagan altars and idols, we as Christians are also to be separate from the world and sin. The pagan nations and their idols represent for us sin and the sinful world—either sin we are trying to avoid or sin we are trying to get rid of.
They were not to desire the silver or gold that the idols were made of (v. 25). In the same way we are not to desire and lust after the sinful things we find pleasure in and that have entrapped us—pornography, fornication, sexual fantasy, masturbation, etc. We must destroy all those idols, that is, all the things that take the place of God and that take us away from God and put us in bondage.
Therefore, if there is anything in your house that makes you lust, get rid of it! If there are sexual images that pop up in your mind say no to them and violently reject them—they are mental idols! Here is some help: When temptation strikes repeat these two verses and mean them:
I will set nothing wicked before my eyes; I hate the work of those who fall away; it shall not cling to me.
I have set the LORD always before me; because He is at my right hand I shall not be moved.
When Israel was obedient to God He bless them. In the same way, if you are obedient to the Lord by rejecting the idols in your mind and by destroying anything in your house that causes you to lust, and if you stay away from all sinful, worldly places, God will love you and bless you with purity. That means that you will be delivered from the bondage and the torment of lust and guilt. Believe me, a pure life is wonderful!! It is a life of freedom and joy in the Lord. A life free from the bondage of sexual sin is a life surrounded by the love and peace of God.
If you need more help on this issue you can also read a more detailed post on this same subject: Practice Keeping Your Eyes Pure: Fighting Against Pornography.