John Wesley on Joel 2:28

Afterward - After the return out of Babylon, after the various troubles and salvations by which these may know that I am the Lord. I will pour - In extraordinary gifts on the first preachers of the gospel, and in various graces to all believers. Upon all flesh - Before these gifts were confined to one particular nation; but now they shall be enlarged to all nations, and all that believe. Shall prophesy - This was in part fulfilled according to the letter in the first days of the gospel; but the promise means farther, by pouring out of the spirit on your sons and your daughters, they shall have as full a knowledge of the mysteries of God's law, as prophets before time had. Shalt dream dreams - This also was literally fulfilled in the apostles days. But it may mean farther, the knowledge of God and his will, shall abound among all ranks, sexes and ages in the Messiah's days, and not only equal, but surpass all that formerly was by prophesy, dreams, or visions.