But Peter, standing up with the eleven, lifted up his voice, and said unto them, Ye men of Judaea, and all [ye] that dwell at Jerusalem, be this known unto you, and hearken to my words:
Note 1 at Ac 2:14: These events on the Day of Pentecost give us a good example of the purpose of the miraculous manifestations of God's power or presence. The miraculous manifestation that accompanied the coming of the Holy Spirit acted like a bell to draw thousands of people's attention to the disciples. The disciples then explained what was happening and preached Jesus to the people. The results were that about 3,000 people were born again.
Likewise today, miracles still draw people's attention to those having received the miracle, and they provide a perfect opportunity to proclaim Jesus as the one who can work miracles in their lives.