He sends the springs into the valleys, which run among the hills.
All Commentaries on Psalms 104:10 Go To Psalms 104
Augustine of Hippo
AD 430
9. Hear. "Thou hast set a bound which they shall not pass over, neither shall they turn again to cover the earth" (ver. 9). What then, because now the bitterest waves have received a measure, that we must be allowed to preach such things even with freedom; because they have had their due limit assigned, because they cannot pass over the bound that is set, nor shall they return to cover the earth; what is doing in the earth itself? What workings take place therein, now that the sea hath left it bare? Although at its beach slight waves do make their noise, although Pagans still murmur round; the sound of the shores I hear, a deluge I dread not. What then; what is doing in the earth? "Who sendeth out springs in the little valleys" (ver. 10). "Thou sendest out," he saith, "springs in the little valleys." Ye know what little valleys are, lower places among the lands. For to hills and mountains, valleys and little valleys are opposed in contrary shape. Hills and mountains are swellings of the land: but valleys and little valleys, lownesses of the lands. Do not despise low places, thence flow springs. "Thou sendest out springs in the little valleys." Hear a mountain. The Apostle saith, "I laboured more than they all." A certain greatness is brought before us: yet immediately, that the waters may flow, he hath made himself a valley: "Yet not I, but the grace of God with me." It is no contradiction that they who are mountains be also valleys: for as they are called mountains because of their spiritual greatness, so also valleys because of the humility of their spirit. "Not I," he saith, "but the grace of God with me." ...
10. What is, "In the midst between the mountains the waters shall pass through"? We have heard who are the "mountains," the great Preachers of the word, the exalted Angels of God, though still in mortal flesh; lofty not by their own power, but by His grace; but as far as relates to themselves, they are valleys, in their humility they send forth springs. "In the midst," he saith, "between the mountains, the waters shall pass through." Let us suppose this said thus, "In the midst between the Apostles shall pass through the preachings of the Word of Truth." What is, in the midst between the Apostles? What is called in the midst, is common. A common property, from which all alike live, is in the midst, and belongs not to me, but neither belongs it to thee, nor yet to me. ...For if they are not in the midst, they are as it were private, they flow not for public use, and I have mine, and he has his own, it is not in the midst for both me and him to have it; but such is not the preaching of peace. ...Therefore, brethren, let what we have said to your Love serve to this purpose, because of the springs: that they may flow from you, be ye valleys, and communicate with all that which ye have from God. Let the waters flow in the midst, envy ye no one, drink, be filled, flow forth when ye are filled. Everywhere let the common water of God have the glory, not the private falsehoods of men. ...