Truth to be Received
That the only true God is He who was revealed to Abraham, Isaac, and Jacob, by angelic visitation and vision, and to Moses at the flaming bush (unconsumed) and at Sinai, and who manifested Himself in the Lord Jesus Christ, as the supreme self-existent Deity, the ONE FATHER, dwelling in unapproachable light, yet everywhere present by His Spirit, which is a unity with His person in heaven. He hath, out of His own underived energy, created heaven and earth, and all that in them is.

Memory Verse
Ye are my witnesses, saith the LORD, and my servant whom I have chosen: that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me. I, even I, am the LORD; and beside me there is no saviour. I have declared, and have saved, and I have shewed, when there was no strange god among you: therefore ye are my witnesses, saith the LORD, that I am God.
Isaiah 43:10-12