One of the two who heard John speak, and followed him, was Andrew, Simon Peter's brother.
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Cornelius a Lapide
AD 1637
Now one of the two, &c. John inserts this to show in what way Peter, who was to be the prince of the Apostles, and the head of the whole Church, was led to Christ. It was because Andrew, being glad at finding and hearing Christ, brought his own brother Peter, for whom he had a singular love, to Him, that he might make him partaker in so great a good. For this zeal, which burns to make others, especially those nearest to us, partakers with us, and to draw them to God, is a mark and an effect of the Divine Vocation. For as fire kindles fire, so does zeal kindle zeal. Moreover, Peter, as well as Andrew, seems to have been a disciple, or at least a diligent hearer of John the Baptist. Which of the two was the elder is not known. The conversion of Peter is the glory and praise of Andrew.
Wherefore then has he not made known the name of the other also? Some say, because it was the writer himself that followed; others, not so, but that he was not one of the distinguished disciples; it behooved not therefore to say more than was necessary. For what would it have advantaged us to learn his name, when the writer does not mention the names even of the seventy-two? St. Paul also did the same. We have sent, says he, with him the brother, (who has often in many things been forward,) whose praise is in the Gospel. 2 Corinthians 8:18 Moreover, he mentions Andrew for another reason. What is this? It is, that when you are informed that Simon having in company with him heard, Follow Me, and I will make you fishers of men Matthew 4:19, was not perplexed at so strange a promise, you may learn that his brother had already laid down within him the beginnings of the faith.
