Tertullian

“ I am, moreover, obliged to say this, when (extolling the Monarchy at the expense of the Economy) they contend for the identity of the Father and Son and Spirit, that it is not by way of diversity that the Son differs from the Father, but by distribution: it is not by division that He is different, but by distinction; because the Father is not the same as the Son, since they differ one from the other in the mode of their being. ”

“ For the Father is the entire substance, but the Son is a derivation and portion of the whole, [2] as He Himself acknowledges: “My Father is greater than I.” [3] In the Psalm His inferiority is described as being “a little lower than the angels.” [4] Thus the Father is distinct from the Son, being greater than the Son, inasmuch as He who begets is one, and He who is begotten is another ”