On the Christian Faith (De fide)

The Emperor is exhorted to display zeal in the Faith. Christ's perfect Godhead is shown from the unity of will and working which He has with the Father. The attributes of Divinity are shown to be proper to Christ, Whose various titles prove His essential unity, with distinction of Person. In no other way can the unity of God be maintained.

12. “Not every one that says unto Me Lord, Lord, shall enter into the kingdom of heaven,” says the Scripture. Faith, therefore, august Sovereign, must not be a mere matter of performance, for it is written, “The zeal of your house has devoured me.” Let us then with faithful spirit and devout mind call upon Jesus our Lord, let us believe that He is God, to the end that whatever we ask of the Father, we may obtain in His name. For the Father's will is, that He be entreated through the Son, the Son's that the Father be entreated.

13. The grace of His submission makes for agreement [with our teaching], and the acts of His power are not at variance therewith. For whatsoever things the Father does, the same also does the Son, in like manner. The Son both does the same things, and does them in like manner, but it is the Father's will that He be entreated in the matter of what He Himself proposes to do, that you may understand, not that He cannot do it otherwise, but that there is one power displayed. Truly, then, is the Son of God to be adored and worshipped, Who by the power of His Godhead has laid the foundations of the world, and by His submission informed our affections.

14. Therefore we ought to believe that God is good, eternal, perfect, almighty, and true, such as we find Him in the Law and the Prophets, and the rest of the holy Scriptures, for otherwise there is no God. For He Who is God cannot but be good, seeing that fullness of goodness is of the nature of God: nor can God, Who made time, be in time; nor, again, can God be imperfect, for a lesser being is plainly imperfect, seeing that it lacks somewhat whereby it could be made equal to a greater. This, then, is the teaching of our faith— that God is not evil, that with God nothing is impossible, that God exists not in time, that God is beneath no being. If I am in error, let my adversaries prove it.

15. Seeing, then, that Christ is God, He is, by consequence, good and almighty and eternal and perfect and true; for these attributes belong to the essential nature of the Godhead. Let our adversaries, therefore, deny the Divine Nature in Christ—otherwise they cannot refuse to God what is proper to the Divine Nature.

16. Further, that none may fall into error, let a man attend to those signs vouchsafed us by holy Scripture, whereby we may know the Son. He is called the Word, the Son, the Power of God, the Wisdom of God. The Word, because He is without blemish; the Power, because He is perfect; the Son, because He is begotten of the Father; the Wisdom, because He is one with the Father, one in eternity, one in Divinity. Not that the Father is one Person with the Son; between Father and Son is the plain distinction that comes of generation; so that Christ is God of God, Everlasting of Everlasting, Fulness of Fulness.

17. Now these are not mere names, but signs of power manifesting itself in works, for while there is fullness of Godhead in the Father, there is also fullness of Godhead in the Son, not diverse, but one. The Godhead is nothing confused, for it is an unity: nothing manifold, for in it there is no difference.

18. Moreover, if in all them that believed there was, as it is written, one soul and one heart: if every one that cleaves to the Lord is one spirit, as the Apostle has said: if a man and his wife are one flesh: if all we mortal men are, so far as regards our general nature, of one substance: if this is what the Scripture says of created men, that, being many, they are one, who can in no way be compared to Divine Persons, how much more are the Father and the Son one in Divinity, with Whom there is no difference either of substance or of will!

19. For how else shall we say that God is One? Divinity makes plurality, but unity of power debars quantity of number, seeing that unity is not number, but itself is the principle of all numbers.