Now unto the King eternal, immortal, invisible, the only wise God, be honor and glory forever and ever. Amen.
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Augustine of Hippo
AD 430
Let us hold firmly that Father and Son and Holy Spirit in their own proper nature, their proper substance, are together and equally invisible. We believe them to be together and equally immortal, together and equally imperishable. There is one place where the apostle states all these things simultaneously, “Now to the king of ages, immortal, invisible, imperishable, to the only God, be honor and glory for ever and ever. Amen.”
In order to attain that vision by which we see God as he is, he has warned us that our hearts must be cleansed. As objects are called visible in our fashion of speaking, so God is called invisible lest he be thought to be a material body. Yet he will not deprive pure hearts of the contemplation of his essence, since this great and sublime reward is promised, on the Lord’s own word, to those who worship and love God. At the time when he appeared visibly to bodily eyes, he promised that his invisible being also would be seen by the clean of heart, “He that loves me shall be loved of my Father, and I will love him and will manifest myself to him.” It is certain that this nature of his, which he shares with the Father, is equally as invisible as it is equally incorruptible. .
So this faith is also a rule for salvation, to “believe in God the Father almighty,” creator of all things, “king of the ages, immortal and invisible.” He is indeed the almighty God who at the origin of the world made all things out of nothing. He is before the ages and made and governs the ages. He doesn’t, after all, grow with time, or stretch out in space, nor is he shut in or bounded by any material. He abides with and in himself as full and perfect eternity, which neither human thought can comprehend nor tongue describe.
We know that of all the names by which Deity is indicated some are expressive of the Divine majesty, employed and understood absolutely, and some are assigned with reference to the operations over us and all creation. When the apostle says, “Now to the immortal, invisible, only wise God,” and the like, by these titles he suggests conceptions which represent to us the transcendent power. In other cases, however, God is spoken of in the Scriptures as gracious, merciful, full of pity, true, good, Lord, Physician, Shepherd, Way, Bread, Fountain, King, Creator, Artificer, Protector, Who is over all and through all, Who is all in all; these and similar titles contain the declaration of the operations of the Divine loving kindness in the creation.
But if you think that God is seen by those who are pure in heart in this world, why did Moses, who had previously said, “I have seen the Lord face to face, and my life is preserved,” afterwards plead that he might see him distinctly? And because he said that he had seen God, the Lord told him, “You cannot not see my face. For no one shall see my face and live.” For this reason also the apostle calls him the only invisible God, who dwells in light unapproachable, whom no man has seen nor can see.
We must first turn our words to prayer. I say this because, sometimes, when prayer accompanies a teaching, it will serve to provide us with a demonstration of the things we are seeking to prove…. And Paul often does this at the beginning of his epistles. He first mentions God and then does not go on to his teaching until he pays to God the glory and praise due to him. Listen: “To the King of ages, the immortal, the invisible, the only God of wisdom, be honor and glory for ever and ever! Amen.”
For these things, then, we glorify not the Son only, but the Father. Here let us argue with the heretics. Speaking of the Father, he says, To the only God. Is the Son then not God? The only immortal. Is the Son then not immortal? Or does He not possess that Himself, which hereafter He will give to us? Yes, they say, He is God and immortal, but not such as the Father. What then? Is He of inferior essence, and therefore of inferior immortality? What then is a greater and a less immortality? For immortality is nothing else than the not being subject to destruction. For there is a greater and a less glory; but immortality does not admit of being greater or less: as neither is there a greater and a less health. For a thing must either be destructible, or altogether indestructible. Are we men then immortal even as He? God forbid! Surely not! Why? Because He has it by nature, but we adventitiously. Why then do you make the difference? Because the Father, he says, is made such as He is by no o...
Fitly did that temporal king and Thy servant once sing of Thee as the King Eternal, saying, Thou art fairer than the children of men, who amongst men art very God and man.
But the time would fail us, ages and succeeding generations too, to render unto thee thy fitting salutation as the mother of the King Eternal,
He is the only Son of God, our Lord. For he is born One of One, because there is one brightness of light, and there is one word of the understanding. Neither does an incorporeal generation degenerate into the plural number or suffer division. The One who is born is in no way separated from the One who gives life. He is the one and only, the unique. He is as thought is to the mind, as wisdom is to the wise, as a word is to the understanding, as valor is to the brave. As the Father is said by the apostle to be “alone wise,” so likewise the Son alone is called wisdom. He is then the “only Son.” In glory, everlastingness, virtue, dominion, power, he is what the Father is. Yet all these he has not unoriginately as the Father but from the Father, as the Son, without beginning and equal. Although he is the head of all things, yet the Father is the head of him. For so it is written, “The head of Christ is God.” Commentary on the Apostles’ Creed