The phrase [Greek: ho uios tou theou] is not peculiar to, though it is more frequent in, and to some degree characteristic of, the Gospel and First Epistle of St.John.
[Greek: Phanerousthai] may be claimed more decidedly, especially by comparison with the other Gospels, though it occurs with similar reference to the Incarnation in the later Pauline Epistles.

[Greek: 'Elthein en sarki] is again rightly classed as a Johannean phrase, though the exact counterpart is found rather in the Epistles than the Gospel.

The doctrine of pre-existence is certainly taught in such passages as the application of the text, 'Let us make man in our image,' which is said to have been addressed to the Son 'from the foundation of the world' (c.

v).
Generally I think it may be said that the doctrine of the Incarnation, the typology, and the use of the Old Testament prophecies, approximate, most distinctly to the Johannean type, though under the latter heads there is of course much debased exaggeration.

The soteriology we might be perhaps tempted to connect rather on the one hand with the Epistle to the Hebrews, and on the other with those of St.Paul.There may be something of an echo of the fourth Gospel in the allusion--to the unbelief and carnalised religion of the Jews.