"Hast thou not known? hast thou not heard, that the everlasting God, the LORD, the Creator of the ends of the earth, fainteth not, neither is weary? there is no searching of his understanding" (Is. 40.28).
Thus, a Unitarian God would not make him any greater than us. Therefore, God must be Trinitarian.
https://www.youtube.com/watch?v=bUy-H5MmeGU
