Now a Jew named Apollos, a native of Alexandria, came to Ephesus. He was an eloquent man, competent in the Scriptures. He had been instructed in the way of the Lord. And being fervent in spirit, he spoke and taught accurately the things concerning Jesus, though he knew only the baptism of John. He began to speak boldly in the synagogue, but when Priscilla and Aquila heard him, they took him aside and explained to him the way of God more accurately. —Acts 18:24-26 ESV
Spurgeon commented on this passage in our reading plan for today:
He had not got farther than that; but it is always well to tell out what you do know. It is the way to learn more; and we doubt not that many a half-instructed Christian is doing good in his way, and it is not for us to stop him, or to find fault with him, but rather quietly to endeavor to tell him more of the truth. Paul did not say, “Now, Apollos, you must stop this, you know. You had better study. You do not know enough yet,” but he let him tell out what he did know.
Knowing God through His Word ... Day by Day 