Mr Avery should heed Augustine's warning!
Contra Maximinum
Book 2, Chapter 22, Section 3
“Sane falli te nolo in Epistola Ioannis apostoli, ubi ait: “Tres sunt testes; spiritus, et aqua, et sanguis; et tres unum sunt.” […]
propter hoc admonui ne fallaris.”
“Certainly I do not want you to be mistaken about the letter of the Apostle John, in that place where he says: “There are three witnesses, the spirit and the water and the blood, and these three are one.” […] It is for this cause that I have admonished you,
so that you may not be mistaken.”