Isaiah 45:18
For thus saith the LORD that created the heavens; God himself that formed the earth and made it; he hath established it, he created it not in vain, he formed it to be inhabited: I am the LORD; and there is none else.
Primary
What this passage establishes
The Creator of heaven and earth identifies Himself as the LORD and denies any other.
Why it matters in the argument
This establishes the controlling biblical confession: every later passage about Father, Son, and Holy Ghost must be read without multiplying the one God.
Apostolic connection
Apostolic teaching begins with the Bible’s own insistence that God is one indivisible divine being, then reads the incarnation as that one God revealed in Christ.
Common misunderstanding
Counting titles, manifestations, or relational language does not overturn the Bible’s explicit statements that God is one and alone.
How to use it in conversation
Start here before discussing difficult relational texts. Establish what Scripture says plainly about how many are God.
Nearby curated context
Isaiah 45:6From east to west, people are to know that there is no God beside the LORD.Isaiah 45:12God says His own hands stretched out the heavens and commanded their host.Isaiah 45:21The just God and Savior declares that no God exists beside Him.Isaiah 45:22The one God invites all the ends of the earth to look to Him for salvation.