You shall have no other gods before Me. Among those who are excluded are those who are guilty of the sin of idolatry. Not just the sin of bowing down before an idol, but the sin of spiritual idolatry or what we might call soul idolatry. According to the words of our text, those who are practicing the sins of immorality, the sins of impurity and the sin of covetousness are idolaters. The worship that is due to God is twofold, external and internal.
External worship has to do with the body.
When a man bows to something, that is an act of worship. But there is also the internal worship, which consists of the acts of the soul. When the mind is taken up with an object, when the affections are set upon in, this is soul worship, and it is due only to the true and living God. He is guilty of soul idolatry. God's word leaves no doubt, secret idolatry will exclude a man from heaven just as certainly as open idolatry.