The Wind and the Spirit

"The wind bloweth where it listeth, and thou hearest the sound thereof, but canst not tell whence it cometh, and whither it goeth: so is every one that is born of the Spirit." - John 3:8

Jesus is explaining that just as the wind has a sound that accompanies it, so likewise the Spirit has a sound that accompanies it. We learn later in the book of Acts, that speaking in tongues is the sound that we hear when a person is born of the Spirit. We cannot see God’s Spirit, but we hear the sound of a person speaking in tongues as God fills them with His Spirit.

"And when the day of Pentecost was fully come, they were all with one accord in one place. And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting. ... And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance." - Acts 2:1-2, 4

Later in the book of Acts when Gentiles received His Spirit,

"And they of the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost. For they heard them speak with tongues, and magnify God." - Acts 10:45-46

Later, Paul witnessed to disciples of John the Baptist,

"And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spake with tongues, and prophesied." - Acts 19:6