John 10:30

I and the Father are one, [2] or one being, not one person, nor one by an union of affection only, but in nature, substance, power, and other perfections, as appears by the whole text: for Christ here tells them that none of his elect shall perish, because no one can snatch them out of his hands, no more than out of the hand of his Father: and then adds, that he and his Father are one, or have one equal power: and if their power, says St. John Chrysostom, is the same, so is their substance. Christ adds, (ver. 38.) that the Father is in him, and he in the Father; which also shews an union of nature and substance, and not only of love and affection, especially when taken with other words of our Saviour Christ. (Witham)

[BIBLIOGRAPHY]

Unum sumus, Greek: en esmen, i.e. says St. John Chrysostom, secundum potentiam. Greek: kata ten dunamin entautha legon. See St. Cyril, p. 667.; St. Augustine, tract. 49. p. 617, Huc usque Judæi tolerare potuerunt... tune vero more suo duri ad lapides concurrunt... ideo irati sunt, quia senserunt non posse dici, Ego et pater unum sumus, nisi ubi æqualitas est Patris et Filii.... Ecce intelligunt Judæi, quod not intellligunt Ariani.