It stood before the Church as an urgent matter requiring resolution, in view of the universal purpose of the Gospel. Everyone remembered the Lord's word: "Preach the Gospel to every creature" (Mk 16:15).
Now the apostle Peter finds that many creatures are unclean. Why? Because according to the Law of the Old Testament, some were recognized as fit for use and others as unfit.
But the same Lawgiver, God, declares that when He has cleansed something, it must no longer continue to be considered unclean. Therefore, when it was commanded to proclaim the Gospel to every creature, one must preach to all.
Those who accept this preaching must no longer be considered unclean. They must be received into communion equally with the Jews.
The miraculous character of the appearance and the threefold instruction, of course, could not fail to move Peter toward deeper reflection on the meaning of the vision. He had to understand it not in the ordinary sense of food.
For what was seen both descended from heaven and ascended there again, as something not material but spiritual. Therefore it had to be considered spiritually.
The command for the apostle to rise is significant in that he was praying on his knees. Or, seeing the opened heaven and what descended from it, he fell on his face.
This is what Old Testament prophets did at especially striking visions; see Dan 10:9. The adaptation of the vision to Peter's hunger is also significant.
It shows that when eating food, one must firmly remember that man shall not live by bread alone. It is good to share food with one who needs it more; see verse 23.
It is still better to share spiritual bread. According to blessed Theophylact's explanation, "Peter, the first of the apostles, needed a divine revelation concerning the calling of the Gentiles to Christian faith.
"He did not know that circumcision and uncircumcision make no difference with respect to faith. He certainly did not clearly know that the Lord had said that, when the ministry of faith was revealed, the Gentiles also were to be taught that faith.
"They did not know this until His ineffable will revealed the mysteries through this appearance." "The vision occurred three times to signify the undoubted truth of what was communicated in it.
It assured Peter of the immutability of the divine determination concerning this."