John 1:49 - Coke's Commentary on the Holy Bible

Rabbi, thou art the Son of God,— It is not improbable but Nathanael had been praying under the fig-tree, and that in his prayer he had made confession of his sins in such a particular and ample manner, as to claim, in that respect, the character which Christ gave of him. Accordingly, when Jesus insinuated that he had given it to him on account of what had passed under the fig-tree, Nathanael immediately perceived that he not only knew what was done at a distance, but could also look into men's hearts; and therefore cried out in great astonishment, that he was the long expected Messiah of the Jews. It may not be improper to observe here, that the Jews universally believed the Son of God would appear on earth, and be that great King whom they had for so many ages expected; as appears from the passage before us, and from John 6:69; John 11:27. Matthew 26:63. It is remarkable, that the woman of Samaria draws the same inference with Nathanael from a similar circumstance; (see ch. John 4:29.) which plainly intimates, that they supposed that the Messiah would be endowed with the most perfect knowledge, and have the gift of prophesy in the highest degree. There was a great deal of courage in Nathanael's making such a declaration as that before us, if it was made before a mixed company: for Christ's assuming the title of Son of God, was afterwards interpreted to be no less than blasphemy. See ch. John 10:36 John 19:7 and John 9:22; John 9:34.