True Christian Religion # 293
293. In the natural or literal sense this commandment also means that no one is to be loved above all except God, nor anything except what comes from God. This too agrees with the Lord's words (Matthew 22:37-39; Luke 10:25-28). Anyone or anything which is loved above all is, to the lover, God and divine. For instance, if anyone loves himself or the world above all else, then he or the world is his own god. This is why such people do not in their hearts acknowledge any God. They are therefore linked with like minds in hell, where all are gathered who have loved themselves or the world above all.
Isaiah 45:21-22
21
Declare and present it. Yes, let them take counsel together. Who has shown this from ancient time? Who has declared it of old? Haven't I, Yahweh? There is no other God besides me, a just God and a Savior; There is no one besides me.
22
"Look to me, and be saved, all the ends of the earth; for I am God, and there is no other.