Philip having himself discovered Christ, is not willing to eat his morsels alone, but desires to communicate his discovery to others; he finds (whether casually, or upon search, is not said) one Nathanael, he was of Cana in Galilee, 1 Thessalonians 21:2. (The name is a Hebrew name, signifying, The gift of God; some think it the same with Nethaneel, 1 Chronicles 15:24.) Having found him, he tells him with great joy, that they had found him of whom Moses had wrote in the law, the Shiloh, mentioned Genesis 49:10, the Prophet, mentioned Deuteronomy 18:15, the Branch of the Lord, mentioned Isaiah 4:2, the Messiah, mentioned by Daniel, Daniel 9:25,26, and all the other prophets, him whom they usually called Jesus of Nazareth, (there he was conceived, there he was bred, Luke 2:4,51, though he was born in Bethlehem of Judah, Luke 2:4), and who was commonly thought to be the son of Joseph. If Philip did only cum vulgo loqui, speak as was commonly said, though himself knew and believed other things, he is not to be blamed; but the most think Philip discovered here his own weakness, both in thinking Christ the son of Joseph, and to have been born at Nazareth. It is certain that the apostles themselves at first, yea, and till Christ's resurrection from the dead, had a very imperfect notion of Christ as the true Messiah. Grace may consist with great weakness as to knowledge.
Related Commentaries of John 1:45
John 1:45
45 Philip findeth Nathanael, and saith unto him, We have found him, of whom Moses in the law, and the prophets, did write, Jesus of Nazareth, the son of Joseph.