The figure is occasioned by, or at all events derives much of its significance from, a geographical peculiarity of Jerusalem. Alone among the great cities and historical centres of the world, it stood upon no broad river. One little perennial stream, or rather rill of living water, was all which it had; but Siloam was mightier and more blessed for the dwellers in the rocky fortress of the Jebusites than the Euphrates, Nile, or Tiber for the historical cities which stood upon their banks. One can see the Psalmist looking over the plain eastward, and beholding in vision the mighty forces which came against them, symbolised and expressed by the breadth and depth and swiftness of the great river upon which Nineveh sat as a queen, and then thinking upon the little tiny thread of living water that flowed past the base of the rock upon which the temple was perched. It seems small and unconspicuous--nothing compared to the dash of the waves and the rise of the floods of those mighty secular empires, still, 'There is a river the streams whereof shall make glad the city of God.' Its waters shall never fail, and thirst shall flee whithersoever this river comes. It is also to be remembered that the psalm is running in the track of a certain constant symbolism that pervades all Scripture. From the first book of Genesis down to the last chapter of Revelation, you can hear the dashing of the waters of the river. 'It went out from the garden and parted into four heads.' 'Thou makest them drink of the river of Thy pleasures.' 'Behold, waters issued out from under the threshold of the house eastward,' and 'everything shall live whithersoever the river cometh.' 'He that believeth on me, out of His belly shall flow rivers of living water.' 'And he shewed me a pure river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb.' Isaiah, who has already afforded some remarkable parallels to the words of our psalm, gives another very striking one to the image now under consideration, when he says, 'The glorious Lord will be unto us a place of broad rivers and streams, wherein shall go no galley with oars.' The picture in that metaphor is of a stream lying round Jerusalem, like the moated rivers which girdle some of the cities in the plains of Italy, and are the defence of those who dwell enclosed in their flashing links. Guided, then, by the physical peculiarity of situation which I have referred to, and by the constant meaning of Scriptural symbolism, I think we must conclude that this river, 'the streams whereof make glad the city of God,' is God Himself in the outflow and self-communication of His own grace to the soul. The stream is the fountain in flow. The gift of God, which is living water, is God Himself, considered as the ever-imparting Source of all refreshment, of all strength, of all blessedness. 'This spake He of the Spirit, which they that believe should receive.'