We, therefore, both know and confess that God is without beginning, without end, eternal and everlasting, uncreate, unchangeable, invariable, simple, uncompound, incorporeal, invisible, impalpable, uncircumscribed, infinite, incognisable, indefinable, incomprehensible, good, just, maker of all things created, almighty, all-ruling, all-surveying, of all overseer, sovereign, judge; and that God is One, that is to say, one essences; and that He is known, and has His being in three subsistences, in Father, I say, and Son and Holy Spirit; and that the Father and the Son and the Holy Spirit are one in all respects, except in that of not being begotten, that of being begotten, and that of procession; and that the Only-begotten Son and Word of God and God, in His bowels of mercy, for our salvation, by the good pleasure of God and the co-operation of the Holy Spirit, being conceived without seed, was born uncorruptedly of the Holy Virgin and Mother of God, Mary, by the Holy Spirit, and became of her perfect Man; and that the Same is at once perfect God and perfect Man, of two natures, Godhead and Manhood, and in two natures possessing intelligence, will and energy, and freedom, and, in a word, perfect according to the measure and proportion proper to each, at once to the divinity, I say, and to the humanity, yet to one composite persons; and that He suffered hunger and thirst and weariness, and was crucified, and for three days submitted to the experience of death and burial, and ascended to heaven, from which also He came to us, and shall come again. And the Holy Scripture is witness to this and the whole choir of the Saints.
John Damascene, De Fide I.2
