We should remember that St. John the Evangelist is that great theologian who carefully picks every single word in his Gospel, and every word has special significance – even the “unspoken” words. So the very omission of a name is indicative of something important.
In scripture you will always find God either calling someone who will become great through some insignificant person; or working his greatest works through the lowliest ones. Thus we find the simple and humble Mary, chosen to be God’s vehicle to bring the Redeemer of the world onto the human scene. We find David, the youngest of many brothers (and therefore unimportant) anointed while a teenager, to become King of Israel. Again, we find Andrew calling his brother Simon and bringing him to Jesus – the same Simon who was renamed “Peter” and who was made the bedrock of the Church by Jesus. We also find the Galilean Philip bringing the wise and scholarly Nathaniel to Jesus.
So in today’s gospel we find two disciples of John the Baptist leaving him to follow one “greater” than him – Jesus the Christ. Recognising John’s work of theology, we therefore assume (logically) that the unnamed disciple who accompanied Andrew to see Jesus also became “greater” in later history; and it was probably John who became St. John the Apostle and Evangelist (and who may also have been the “beloved disciple” in this same gospel).
There is a lesson in humility here, among other things. Jesus taught this very well when he said, “He who humbles himself will be exalted.” There is also a lesson in observing what these humble people do. They are always on an active search for a closer relationship with God, and they are always available and willing to serve God and His people at all times. This is a definition of “faith in action.” By “staying with” Jesus and becoming his disciples, the Apostles learnt to imitate the mission of Christ, “to serve and to give his life” for others.
Each one of us is called personally by God to “stay with” Jesus, to follow His way, and to continue His mission of spreading the Good News (in a manner appropriate to our vocation in life)..Jesus' baptism was his full acceptance of his mission. Today we’re reminded that our "mission" also starts at our baptism, the sacrament of faith, when we became adopted ("reborn as") sons and daughters of God. Our mission is to follow Jesus and imitate him, spreading the Good News of his salving love and "becoming Christ" for others. May we all realise that our heavenly Father is also "well pleased" with us when He finds us at regular prayer- just like His son.
Read also Catechism of the Catholic Church (CCC) items: #608 and #871