All God's People Will Prophesy (excerpt from John Piper)
Joel goes on to say that when God makes himself known and felt in people's lives, this can manifest itself in three ways: they may dream dreams, see visions, and prophesy (
Joel 2:28). What a person dreams about is a sign of what his mind is saturated with. What looms up in his mind's eye while strolling alone signals whether he is soaked in God. And you can usually tell whether a person has been drenched with the Spirit by whether his mouth is given to declaring the excellencies of God. When God almighty pours himself into an individual, the inner life is changed; it is filled with God. And since the mouth is simply the pressure valve of the inner life, when the inner life is full of God, the mouth prophesies.
We must not think of prophecy mainly as prediction, though it is true that those who are closest to God will know best what he is likely to do next. Nor should we think of it as the fulfillment of a special office. Prophecy, as it is used here I think, is primarily verbalizing the great things you have seen of God for the sake of "upbuilding and encouragement and consolation," as Paul says in
1 Corinthians 14:3. Joel is not trying to get us excited that we will all one day be able to know the future before it happens (there is nothing especially holy about that). He is looking to a day when men and women everywhere will be so filled with God that they catch visions of him in the daytime, dream about him at night, and speak of him continually with their mouths. The best evidence for this is that when in fact the Spirit was poured out like this at Pentecost, the result was that those filled with the Spirit "spoke the mighty works of God" (
Acts 2:11). The miracle of "tongues" enabled all to understand, but the important thing is what they said. Tongues is just one variety of prophetic speech.
This is what was spoken by the prophet Joel: your sons and daughters will prophesy.