Albert Barnes Commentary Acts 18:23

"And having spent some time [there], he departed, and went through the region of Galatia, and Phrygia, in order, establishing all the disciples." — Acts 18:23 (ASV)

The country of Galatia and Phrygia. He had been over these regions before, preaching the gospel, Acts 16:6.

Strengthening. Establishing them by exhortation and counsel. See Barnes on 1 Corinthians 1:12.