THIRD ARTICLE: TESTIMONY OF TRADITION AND THE PRINCIPAL DEFINITIONS OF THE CHURCH

A more detailed account of tradition and the definition of the Church is given in the history of dogmas and in patrology. In this treatise we shall give a brief summary of what everyone is expected to know about these matters.[158] We notice that considerable progress has been made in the development of dogma in the course of combating the various heresies.

1) In the first three centuries, the Fathers affirm that Christ is both God and man, because He came to save and redeem us, which He could not have done unless He had been both God, the author of grace, and also man.[159] Hence they reject the errors of the Docetae, who said that Christ's body was imaginary and fantastic, and of the Dualists, who declared that the divine and human natures in Christ were united accidentally.[160] We find Tertullian, in his days, asserting that the union of the two natures in Christ was effected "in one person."[161]

2) In the fourth century, whereas the Apollinarists denied a rational soul to Christ, meaning to say that the Word took the place of the mind in Christ, the Fathers clearly affirm that Christ is both perfect God and perfect man; and they also assert that what was not assumed was not healed. If, therefore, the Word did not assume a rational soul, the soul was not healed; and besides, Christ could not have merited and been obedient.[162]

3) Finally, in the fifth century, the Nestorians declared that the union of the two natures in Christ was only accidental, and the Eutychians asserted that there was only one nature in Christ. Against these heresies the Catholic concept of one person in Christ and of the hypostatic union is explicitly affirmed, and these points must be fully explained farther on.[163]

Following are the principal definitions of the Church concerning the divinity of Christ.[164]

1) Christ is truly God, He is rightly called the Word, and Son of the Father, consubstantial with the Father, equal to Him, God of God, begotten not made, the only-begotten of the Father by natural and not by adoptive sonship.

2) "I believe in Jesus Christ, our Savior...," which is the most ancient formula.[165]

3) "I believe in Jesus Christ, His only Son [of the Father] our Lord,"[166] which is the more ancient formula in the Western Church.

4) The Creed of St. Epiphanius proposed to the catechumens of the Eastern Church: "We believe in one God... and in one Lord Jesus Christ the Son of God, begotten of God the Father, the only-begotten, that is, of the substance of the Father, God of God, light of light, true God of true God, begotten not made, consubstantial with the Father by whom all things were made... who for us men and for our salvation came down from heaven and was incarnate."[167]

5) The First Council of Nicaea (325) defines, against the Arians: "We believe in one God the Father almighty, Maker of all things visible and invisible. And in our one Lord Jesus Christ, the Son of God, the only-begotten of the Father, that is, of the substance of the Father, God of God, light of light, true God of true God, begotten not made, one in substance with the Father, by whom all things were made, both in heaven and on earth, who for our salvation came down, was incarnate, and was made man, suffered and rose again the third day, ascended into heaven, and will come to judge the living and the dead."[168] All these words of the Nicene Council must be seriously considered farther on, when we explain the articles of St. Thomas. The preceding testimony and definitions suffice for establishing the fact of the Incarnation.