The Sermon on the Mount, with its stringent requirements, absolutely demands to be completed by other thoughts and other 'sayings of Mine.' And so I remind you, not only that there are other 'sayings of Mine' to be kept than it, but also that there is no keeping of it without keeping other sayings first. For the highest of Christ's commandments is 'Believe also in Me,' and you have to take Him as your Redeemer and Saviour from death before you will ever thoroughly accept Him as your Guide and Pattern for life. We must first draw near to Him in humble penitence and lowly faith, and then there comes into our hearts a power which makes it possible and delightsome to keep even the loftiest, and in other aspects the hardest, of 'those sayings of Mine.' So, brethren, the obedience of which this text speaks is second, and the building of ourselves on Jesus Christ Himself, by faith in Him, is first. Only when we build on Him as our Saviour shall we build our lives upon Him in obedience to His commands.
'Behold! I lay in Zion for a foundation, a stone, a tried corner-stone, a sure foundation, and he that believeth shall not make haste'; and long after the prophet said that, the Apostle catches up the same thought when he says, 'Other foundation can no man lay than that is laid. Let every man take heed how he buildeth thereon.' Jesus Christ is the foundation of our lives, if we have any true life at all. He ought to be the foundation of all our thinking. His word should be the absolute truth, His life the final all-satisfying, perfect revelation of God, to our hearts. 'In Him are hid all the treasures of wisdom and knowledge.' The facts of His Incarnation, earthly life, Death, Resurrection, Ascension, and present Sovereignty--these facts, with the truths that are deduced from them, and the great glimpses which they afford into the heart of God and the depths of things, are the foundations of all true thinking on moral and social and religious questions, and on not a few other questions besides. Christ in His Revelation gives us the ultimate truth on which we have to build.
He is also the foundation of all our hope, the foundation of all our security, the foundation of all our effort and aspiration. His Cross goes before the nations and leads them, His Cross stands by the individual, and anodynes the sense of guilt, and breaks the bondage and captivity of sin, and stirs to all lofty emotions and holy living, and moves ever in the van like the pillar of cloud and fire, the Pattern of our lives and the Guide of our pilgrimage. It is Christ Himself who is the foundation, and His death and sacrifice which are the sure basis of our hope, safety, and blessedness; and it is only because He Himself is the Foundation, and what He has done for us is the basis of hope and blessedness, that He has the right to come to us and say, 'Take My commandments as the foundation on which you build your lives.'
The Rock of Ages cleft for us, is the Rock on which we build if we are Christians; the other man built his house upon the sand. That is to say, shifting inclinations, short-lived appetites, transitory aims, varying judgments of men, the fashions of the day in morality, the changing judgments of our own consciences--these are the things on which men build, if they are not building upon Jesus Christ. Like a vessel that has a raw hand at the helm, you sometimes head one way, and then the puff of wind that fills your sails dies down, or the sails that were flat as a board belly out a little, or you are caught in some current, and round goes the bowsprit on another tack altogether. How many of us are pursuing the objects which we pursued five-and-twenty years ago, if we have numbered so many years? What has become of aims that were everything to us then? We have won some of them, and they have turned out not half as good as we thought they would be. The hare is never so big when it is in the bag as when it is hurrying across the fields. We have missed some of them, and we scarcely remember that we once wanted them. We have outlived a great many, and they lie away behind us, hull down on the horizon, and we are making for some other point that, in like manner, if we reach it, will be left behind and be lost. There is nothing that lasts but God and Christ, and the people that build their lives upon them.