It had already been passed through by Christ. Therefore one must follow Christ, not John. As a prudent man, Apollos did not reject the teaching of simple people.
"Behold, learned men also begin to preach," exclaims Saint John Chrysostom. "Do you see the success of the preaching? Probably he was baptized.
At least, if the other disciples of John were baptized again after their baptism, see Acts 19:2-5, then these disciples also had to do the same."
Blessed Theophylact notes that this is the Apollos about whom Paul wrote: "As for brother Apollos, I strongly urged him" (1 Cor 16:12). He also wrote, "I planted, Apollos watered, but God gave the increase" (1 Cor 3:6).
Theophylact adds that Apollos was later bishop of Corinth.
"There is nothing surprising in Apollos having received a serious education in his native Alexandria. He also received a direction under the influence of the Jewish-Hellenistic theologizing of Philo and others like him.
According to the testimony of the holy writer of Acts, he was an eloquent man. By this name, Saint Luke wants to convey both Apollos's general scholarly education and his oratorical talent.
Apollos possessed the latter to such a degree that later in Corinth, through it, he acquired among some people a fame greater than even the Apostle Paul himself enjoyed.
Evidently, this was a richly gifted nature, able to remain on the true path in the study and understanding of the Scriptures.
When reports about John the Baptist reached Apollos, John who preached about the Messiah coming after him, he fervently and sincerely believed this preaching and received John's baptism.
Having unwaveringly believed in the truth of John's preaching, he came to Ephesus to proclaim it. Now he is in the Ephesian synagogue.
Without going beyond the limits of the Johannine instruction he had received, he began to speak somewhat about the Lord.
The eloquence and heartfelt ardor of the convinced evangelist made a strong impression on the hearers. But the content of the preaching itself was not new.
Aquila and Priscilla, who attended the synagogue, became close to him. They brought him into the Christian community that had formed around them and explained the way of the Lord to him more accurately."