Jesus explained that like the wind the Holy Spirit is invisible but powerful, and you can’t predict, explain or control the movements of the wind.
This was the word from the Lord they had been longing to hear. After their sackcloth and ashes, their weeping and mourning, weakened from their fasts, and sacrifices, and prayers, they longed with every fiber of their being to hear some token of God’s love and mercy towards them.
Peter’s simple, straightforward logic, and God’s obvious affirmation, rendered them speechless. There was no tenable argument, no counterpoint could be made, God had made His desire and will abundantly clear. But this issue was going to crop again and again. Prejudice is hard to get rid of.