Matthew Henry Commentary Acts 18:24-28

"Now a certain Jew named Apollos, an Alexandrian by race, an eloquent man, came to Ephesus; and he was mighty in the scriptures. This man had been instructed in the way of the Lord; and being fervent in spirit, he spake and taught accurately the things concerning Jesus, knowing only the baptism of John: and he began to speak boldly in the synagogue. But when Priscilla and Aquila heard him, they took him unto them, and expounded unto him the way of God more accurately. And when he was minded to pass over into Achaia, the brethren encouraged him, and wrote to the disciples to receive him: and when he was come, he helped them much that had believed through grace; for he powerfully confuted the Jews, [and that] publicly, showing by the scriptures that Jesus was the Christ." — Acts 18:24-28 (ASV)

Apollos taught the gospel of Christ as far as John's ministry would carry him, and no further. We cannot help but think he had heard of Christ's death and resurrection, but he was not informed about their mystery. Though he did not have the miraculous gifts of the Spirit, as the apostles did, he made use of the gifts he had. The dispensation of the Spirit, whatever its measure may be, is given to every man to profit withal.

He was a lively, affectionate preacher, fervent in spirit. He was full of zeal for the glory of God and the salvation of precious souls. Here was a complete man of God, thoroughly furnished for his work. Aquila and Priscilla encouraged his ministry by attending it. They did not despise Apollos themselves, or undervalue him to others, but considered the disadvantages he had labored under.

And having themselves gained knowledge of the truths of the gospel through their long association with Paul, they shared what they knew with him. Young scholars can gain a great deal from conversation with older Christians. Those who believe through grace still need help. As long as they are in this world, there are remnants of unbelief, and something lacking in their faith that needs to be perfected, and the work of faith that needs to be fulfilled.

If the Jews were convinced that Jesus is Christ, even their own law would teach them to listen to Him. The business of ministers is to preach Christ. Not only to preach the truth, but also to prove and defend it, with meekness, yet with power.