Ockham on there not being one universal human substance

" …it would follow that God would not be able to annihilate one individual substance without destroying the other individuals of the same kind. For, if he were to annihilate one individual, he would destroy the whole that is essentially that individual and, consequently, he would destroy the universal that is in it and in others of the same essence. Other things of the same essence would not remain, for they could not continue to exist without the universal that constitutes a part of them." [Opera Philosophica I, p. 51]

Clement: Non natural relation to God

"For a man is made to communicate by righteousness, and bestows what he received from God, in consequence of his natural benevolence and relation, and the commands which he obeys. But God has no natural relation (φυσικὴν σχέσιν) to us, as the authors of the heresies will have it; neither on the supposition of His having made us of nothing, nor on that of having formed us from matter; since the former did not exist at all, and the latter is totally distinct from God unless we shall dare to say that we are a part of Him, and of the same essence as God. And I know not how one, who knows God, can bear to hear this when he looks to our life, and sees in what evils we are involved. For thus it would turn out, which it were impiety to utter, that God sinned in [certain] portions, if the portions are parts of the whole and complementary of the whole; and if not complementary, neither can they be parts. But God being by nature rich in pity, in consequence of His own goodness, cares for us, though neither portions of Himself, nor by nature His children. And this is the greatest proof of the goodness of God: that such being our relation to Him, and being by nature wholly estranged (φύσει ἀπηλλοτριωμένων παντελῶς), He nevertheless cares for us. For the affection in animals to their progeny is natural, and the friendship of kindred minds is the result of intimacy. But the mercy of God is rich toward us, who are in no respect related to Him; I say either in our essence or nature, or in the peculiar energy of our essence (δυνάμει τῇ οἰκείᾳ τῆς οὐσίας), but only in our being the work of His will." (Clement of Alexandria, Str. II,16.74.1)

Origen on the insufficiency of human nature and the need for revelation

"[...]human nature is not sufficient in any way to seek for God and to find Him in His pure nature, unless it is helped by the God who is object of the search. And He is found by those who, after doing what they can, admit that they need Him, and shows Himself to those to whom He judges it right to appear, so far is it is possible for God to be known to man and for the human soul which is still in the body to know God." (Con. Cel. VII,42)

Origen on our lack of knowledge about God's characteristics in a transcendent sense

"[...]if we understand the words of which we know as applying to everything, we know of many characteristics which may be predicated of God. For He possesses virtue and blessedness and divinity. But if anyone were to understand in a more transcendent sense the words of which we know, since all that we know is inferior to God as He really is, it is not wrong that we also should accept the view that God has no characteristics of which we know. The attributes of God are superior to any which are known not only to human nature, but even by the nature of beings who haven risen beyond it." (Con. Cel. VI,62)