4 But some man coming across us, knowing not what he is saying, says, For this reason was it said, “I and My Father are One; for that They have with One Another an agreement of will, not because the Nature of the Son is the Very Same as the Nature of the Father. For the Apostles too (now this is what he said, not I), for the Apostles too are one with the Father and the Son.” Horrible blasphemy! “And the Apostles,” says he, “are one with the Father and the Son, in that they obey the will of the Father and the Son.” Has he dared to say this? Let Paul then say, “I and God are one.” Let Peter say it, let every one of the Prophets say, “I and God are one.” They do not say it; God forbid they should. They know that they are a different nature, a nature that needs to be saved; they know that they are a different nature, a nature that needs to be enlightened. No one says, “I and God are one.” Whatsoever progress he may make, howsoever he may surpass others in holiness, with how great eminence soever of virtue he may excel, he never says, “I and God are one.” for if he have excellence, and therefore says it; by saying it, he loses what he had.
Source: Sermons on Selected Lessons of the New Testament (New Advent)