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.'
We must dwell for a moment or two still further upon these words, and mark how this metaphor, in a most simple and natural way, sets forth very grand and blessed spiritual truths with regard to this communication of God's grace to them that love Him and trust Him. First, I think we may see here a very beautiful suggestion of the manner, and then of the variety, and then of the effects of that communication of the divine love and grace.
We have only to read the previous verses to see what I mean. 'God is our refuge and strength, a very present help in trouble. Therefore will not we fear, though the earth be removed, and though the mountains be carried into the midst of the sea; though the waters thereof roar and be troubled, though the mountains shake with the swelling thereof.' There you can hear the wild waves dashing round the base of the firm hills, sapping their strength, and toppling their crests down in the bubbling, yeasty foam. Remember how, not only in Scripture but in all poetry, the sea has been the emblem of endless unrest. Its waters, those barren, wandering fields of foam, going moaning round the world with unprofitable labour, how they have been the emblem of unbridled power, of tumult and strife, and anarchy and rebellion! Then mark how our text brings into sharpest contrast with all that hurly-burly of the tempest, and the dash and roar of the troubled waters, the gentle, quiet flow of the river, 'the streams whereof make glad the city of God'; the translucent little ripples purling along beds of golden pebbles, and the enamelled meadows drinking the pure stream as it steals by them. Thus, says our psalm, not with noise, not with tumult, not with conspicuous and destructive energy, but in silent, secret underground communication, God's grace, God's love, His peace, His power, His almighty and gentle Self flow into men's souls. Quietness and confidence on our sides correspond to the quietness and serenity with which He glides into the heart. Instead of all the noise of the sea you have within the quiet impartations of the voice that is still and small, wherein God dwells. The extremest power is silent. The mightiest force in all the universe is the force which has neither speech nor language. The parent of all physical force, as astronomers seem to be more and more teaching us, is the great central sun which moveth all things, which operates all physical changes, whose beams are all but omnipotent, and yet fall so quietly that they do not disturb the motes that dance in their path. Thunder and lightning are child's play compared with the energy that goes to make the falling dews and quiet rains. The power of the sunshine is the root power of all force which works in material things. And so we turn, with the symbol in our hands, to the throne of God, and when He says, 'Not by might, nor by power, but by My Spirit,' we are aware of an energy, the signature of whose might is its quietness, which is omnipotent because it is gentle and silent. The seas may roar and be troubled, the tiny thread of the river is mightier than them all.