John 1:50

ὁ υἱὸς τ. θ. Experience of His miraculous knowledge convinces Nathanael, as it convinces the Samaritan woman (John 4:29) and S. Thomas (John 20:28), that Jesus must stand in the closest relation to God: hence he uses this title of the Messiah (John 11:27; Matthew 26:63; Mark 3:11; Mark 5:7; Luke 4:41) rather than the more common ‘Son of David.’

βας. εἶ τ. Ἰσρ. No article. The title is not synonymous with ‘the Son of God,’ though both apply to the same person, and it points to hopes of an earthly king, which since the destruction of Jerusalem even Jews must have ceased to cherish. How could a Christian of the second century have thrown himself back to this?