Tertullian

“ Heretics Encourage and Perpetuate Thought Independent of Christ’s Teaching.
Now, with regard to this rule of faith—that we may from this point [1] acknowledge what it is which we defend—it is, you must know, that which prescribes the belief that there is one only God, and that He is none other than the Creator of the world, who produced all things out of nothing through His own Word, first of all sent forth ”