1. Jerusalem shall be a spring of living waters to the world; it was made so when there the Spirit was poured out upon the apostles, and thence the word of the Lord diffused itself to the nations about (v. 8): Living waters shall go out from Jerusalem; for there they began, and thence those set out who were to preach repentance and remission of sins unto all nations, Luke xxiv. 47. Note, Where the gospel goes, and the graces of God's Spirit go along with it, there living waters go; those streams that make glad the city of our God make glad the country also, and make it like paradise, like the garden of the Lord, which was well watered. It was the honour of Jerusalem that thence the word of the Lord went forth (Isa. ii. 3); and thus far, even in its worst and most degenerate age, for old acquaintance-sake, it was made a blessing, and to be so is to be blessed. Half of these waters shall go towards the former sea and half towards the hinder sea, as all rivers bend their course towards some sea or other, some eastward, others westward. The gospel shall spread into all parts of the world, into some that lie remote from Jerusalem one way and others that lie as far off another way; for the dominion of the Redeemer, which was thereby to be set up, must be from sea to sea (Ps. lxxii. 8), and the earth must be full of the knowledge of the Lord, as the waters cover the sea, and as the waters that in various channels run to the sea. The knowledge of God shall diffuse itself, (1.) Every way. These living waters shall produce both eastern churches and western churches, that shall each of them in its turn be illustrious. (2.) Every day: In summer and in winter it shall be. Note, Those who are employed in spreading the gospel may find themselves work both winter and summer, and are to serve the Lord therein at all seasons, Acts xx. 18. And such a divine power goes along with these living waters that they shall not be dried up, nor the course of them be obstructed, either by the droughts in summer or by the frosts in winter.