Acts 10:19

We have here the meeting between Peter the apostle, and Cornelius the centurion. Though Paul was designed to be the apostle of the Gentiles, and to gather in the harvest among them, and Peter to be the apostle of the circumcision, yet it is ordered that Peter shall break the ice, and reap the first-fruits of the Gentiles, that the believing Jews, who retained too much of the old leaven of ill-will to the Gentiles, might be the better reconciled to their admission into the church, when they were first brought in by their own apostle, which Peter urges against those that would have imposed circumcision upon the Gentile converts (Act 15:7), You know that God made choice among us that the Gentiles by my mouth should hear the word of the gospel. Now here, I. Peter is directed by the Spirit to go along with Cornelius's messengers (Act 10:19, Act 10:20), and this is the exposition of the vision; now the riddle is unriddled: While Peter thought on the vision; he was musing upon it, and then it was opened to him. Note, Those that would be taught the things of God must think on those things; those that would understand the scriptures must meditate in them day and night. He was at a loss about it, and then had it explained, which encourages us, when we know not what to do, to have our eyes up unto God for direction. Observe, 1. Whence he had the direction.

— Matthew Henry's Concise Commentary (public domain)