John Chrysostom
Nathanael's turning to Christ is not so astonishing, because the report about Jesus had spread throughout all Syria. More astonishing is the turning of Peter, James, and Philip.
This is not only because they believed before they saw the miracles of Jesus Christ. It is also because they were from Galilee, from which no prophet had come and from which nothing good could be expected, since the Galileans were an uneducated, wild, and rough people.
Yet Christ revealed His power here also, choosing the worthiest disciples from a land that bore no fruit. Therefore Philip probably followed Christ after seeing Peter's companions and hearing about Christ from John.
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It is also probable that the voice of Christ produced its effect in him. Christ knew who would be useful to Him. But the Evangelist passes all this over.
Philip knew that Christ was to come, but he did not know that the Christ was Jesus. I think he heard this either from Peter or from John. The Evangelist also names Philip's village to show how "God chose what is weak in the world" (1 Cor 1:27).
"Can anything good come out of Nazareth?" Nathanael only thought that Philip had mistakenly named the place of His coming. Notice also how cautiously he expresses his doubt, in the form of a question.
He does not say, "Galilee produces nothing good." How does he speak? "Can anything good come out of Nazareth?"
But Philip too was very prudent. Meeting an objection, he is not vexed and does not take offense. He simply stands his ground, desiring to bring this man to Christ Himself. From the beginning he shows in himself the firmness of spirit proper to an Apostle.