Today we see the fulfillment of Jesus’ promise from Acts 1:8… “you will receive power when the Holy Spirit has come upon you, and you will be my witnesses in Jerusalem and in all Judea and Samaria, and to the end of the earth.”
John Piper asserts that this power of the Spirit is “an extraordinary power. The experience promised is beyond the power of the Spirit in new birth and gradual sanctification.” He goes on to explain,
This promise that the disciples would receive power when the Holy Spirit came upon them (Acts 1:8) and that they would be clothed with power from on high (Luke 24:49) was a promise given to sustain the completion of world evangelization, and all the ministry that supports it. The context of both texts makes that plain. “You will receive power when the Holy Spirit comes upon you, and you will be my witnesses . . . to the end of the earth.” (Excerpted from Tongues of Fire and the Fullness of God By John Piper. ©2013 Desiring God Foundation. Website: desiringGod.org)
Every now and then throughout the New Testament and church history, the Spirit comes in an unusually powerful way. Even though it manifests itself in different ways (i.e. the building shaking in Acts 4), it typically comes for the purpose of evangelization… In today’s reading, the Spirit comes as tongues of fire and enables the disciples to speak in different languages – all for the purpose of expanding the Kingdom!
This coming of the Spirit at Pentecost signifies the beginning of the New Covenant age.
In Jeremiah 34-35, we see why we need a “New” Covenant. The Old Covenant was dependent on the people’s obedience – which they miserably failed to do. Similarly, our hearts are exceedingly sinful, and it is impossible for us to meet the demands of the Covenant.
So God in his mercy made a New Covenant. A covenant dependent on Jesus’ obedience and Jesus’ sacrifice – and this New Covenant is available to anyone who believes – people from all nations and languages. This was evident at Pentecost as Jews were gathered from “every nation under heaven” (Acts 2:5)…
Parthians and Medes and Elamites and residents of Mesopotamia, Judea and Cappadocia, Pontus and Asia, Phrygia and Pamphylia, Egypt and the parts of Libya belonging to Cyrene, and visitors from Rome.
It is fitting that the first converts to Christianity were Jews representing every nation in the world! This work of the Spirit has so affected history that we are still affected by this event 2,000 years later. That’s one mighty work :)