My Christian sisters, face the mirror, the law of God, and test your course of action by the first four commandments. These explicitly define our duty to God. He claims the undivided affections; and anything which tends to absorb the mind and divert it from God assumes the form of an idol. The true and living God is crowded out of the thoughts and heart, and the soul-temple is defiled by the worship of other gods before the Lord. “Thou shalt have no other gods before Me,” says the commandment. Let us search the heart, compare the life and character with the statutes and precepts of Jehovah, and then seek diligently to correct our errors. 4T 632.1 The last six commandments specify the duties of man to his fellow men. Here are brought to view solemn obligations which are trampled upon every day by professed commandment keepers. Those who have been enlightened by the grace of God, who have been adopted into the royal family, ought not always to be children in the work of the Lord. If they…
"Thou shalt have no other gods before me."
EGW directly quotes Exodus 20:3, making it an explicit allusion. The context in EGW's writing reinforces the meaning of avoiding idolatry.
"What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own?"
EGW's statement about the 'soul-temple' being defiled by the worship of other gods is a clear parallel to the concept of the body being the temple of the Holy Spirit in 1 Corinthians 6:19. Both passages emphasize the importance of keeping oneself pure and dedicated to God.