And then, still further, this faithful, steadfast heart and mind, kept by God, is a mind filled with deepest peace. There is something very beautiful in the prophet's abandoning the attempt to find any adjective of quality which adequately characterises the peace of which he has been speaking. He falls back upon the expedient which is the confession of the impotence of human speech worthily to portray its subject when he simply says, 'Thou shalt keep in peace, peace ... because he trusteth in Thee.' The reduplication expresses the depth, the completeness of the tranquillity which flows into the heart, Such continuity, wave after wave, or rather ripple after ripple, is possible even for us. For, dear brethren, the possession of this deep, unbroken peace does not depend on the absence of conflict, on distraction, trouble, or sorrow, but on the presence of God. If we are in touch with Him, then our troubled days may be calm, and beneath all the surface tumult there may be a centre of rest. The garrison in some high hill-fortress looks down upon the open where the enemy's ranks are crawling like insects across the grass, and scarcely hears the noise of the tumult, and no arrow can reach the lofty hold. So, up in God we may dwell at rest whate'er betide. Strange that we should prefer to live down amongst the unwalled villages, which every spoiler can harry and burn, when we might climb, and by the might and the magic of trust in the Lord bring round about ourselves a wall of fire which shall consume the poison out of the evil, even whilst it permits the sorrow to do its beneficent work upon us! III. Note again the worthiness of the divine Name to evoke, and the power of the divine character to reward, the trust. We pass to the last words of _my_ text:--'In the Lord Jehovah is everlasting strength.' Now I suppose we all know that the words feebly rendered in the Authorised Version 'everlasting strength' are literally 'the Rock of Ages'; and that this verse is the source of that hallowed figure which, by one of the greatest of our English hymns, is made familiar and immortal to all English-speaking people. But there is another peculiarity about the words on which I dwell for a moment, and that is, that here we have, for one of the only two times in which the expression occurs in Scripture, the great name of Jehovah reduplicated. 'In Jab Jehovah is the Rock of Ages.' In the former verse the prophet had given up in despair the attempt to characterise the peace which God gave, and fallen back upon the expedient of naming it twice over. In this verse, with similar eloquence of reticence, he abandons the attempt to describe or characterise that great Name, and in adoration, contents himself with twice taking it upon his lips, in order to _impress_ what he cannot _express_, the majesty and the sufficiency of that name.