Or if we do not care to go so deep as that, let us take the metaphor that lies in the word itself, without reference to its Scriptural applications. As the limpet holds on to its rock, as the ivy clings to the wall, as a shipwrecked sailor grasps the spar which keeps his head above water, so a Christian man ought to hold on to God, with all his energy, and with all parts of his nature. The metaphor implies tenacity; closeness of adhesion, in heart and will, in thought, in desire, and in all the parts of our receptive humanity, all of which can touch God and be touched by Him, and all of which are blessed only in the measure in which, yielding to Him, they are filled and steadied and glorified. And there is implied, too, not only tenacity of adherence, but tenacity in the face of obstacles. There must be resistance to all the forces which would detach, if there is to be union with God in the midst of life in the world. Or, to recur for a moment to the figure that I employed a moment ago, as the sailor clings to a spar, though the waves dash round him, and his fingers get stiffened with cold and cramped with keeping the one position, and can scarcely hold on, but he knows that it is life to cling and death to loosen, and so tightens his grasp; thus have we to lay hold of God, and in spite of all obstacles, to keep hold of Him. Our grasp tends to slacken, and is feeble at the best, even if there were nothing outside of us to make it difficult for us to get a good grip. But there are howling winds and battering waves blowing and beating on us, and making it hard to keep our hold. Do not let us yield to these, but in spite of them all let our hearts tighten round Him, for it is only in His sweet, eternal, perfect love that they can be at rest. And let our thoughts keep close to Him in spite of all distractions, for it is only in the measure in which His light fills our minds and His truth occupies our thoughts that our thinking spirits will be at rest. And let our desires, as the tentacles of some shell-fish fasten upon the rock, and feel out towards the ocean that is coming to it, let our desires go all out towards Him until they touch that after which they feel, and curl round it in repose and in blessedness. The whole secret of a joyful, strong, noble Christian life lies here--that on the foundation of faith we should rear tenacious adherence to Him in spite of all obstacles. So it was a most encyclopaedic, though laconic, exhortation that that 'good man' sent down from Jerusalem to encourage the first heathen converts gave, when instead of all other instruction or advice, or inculcation of less important, and yet real, Christian duties, Barnabas exhorted them all 'that with purpose of heart'--the full devotion of their inmost natures--'they should cleave to the Lord.'