John Calvin Commentary Acts 18:22

"And when he had landed at Caesarea, he went up and saluted the church, and went down to Antioch." — Acts 18:22 (ASV)

When he came down to Caesarea. Though Luke says briefly that Paul greeted the Church at Jerusalem, it is still certain that he was drawn there by some great necessity. And yet we may gather from this text that he did not stay long at Jerusalem, perhaps because things did not turn out as he wished.

Moreover, he declares that his return journey was not idle or unproductive, as he says that he strengthened all the disciples, undoubtedly not without great pains, because he was compelled to go here and there, and often to turn out of his way; for this word [καθεξης] signifies a continual course.

Now, we have already explained (Acts 9:36) in what respect those are called disciples who had given their names to Christ and professed the name of Christ; namely, because there is no godliness without true instruction.

They had, indeed, their pastors under whom they could profit. Yet, Paul’s authority was greater, and the spirit given to him more excellent; thus, they were considerably strengthened by his work among them, especially since he was the chief builder in the founding of all these churches.