In verse 45 the same idea is presented under a different figure--that of a wealthy man who brings his possessions out of his store-house. The application of the figure is significantly varied so as to include the other great department of human activity. Speech is act. It, too, will be according to the cast of the inner life. Of course, feigned speech of all sorts is not in view. The lazy judgment of men thinks less of words than of deeds. Christ always attaches supreme importance to them. Intentional lying being excluded, speech is an even more complete self-revelation than act. When one thinks of the floods of foul or idle or malicious talk which half drown the world as being revelations of the sort of hearts from which they have gushed, one is appalled. What a black, seething fountain that must be which spurts up such inky waters!
III. The third parable, of the two houses, shows in part how hearts may be made 'good.' It is attached to the preceding by verse 46. Speech does not always come from 'the abundance of the heart.' Many call Him Lord who do not act accordingly. Deeds must confirm words. If the two diverge, the latter must be taken as the credible self-revelation. Now the first noticeable thing here is Christ's bold assumption that His words are a rock foundation for any life. He claims to give an absolute and all-sufficient rule of conduct, and to have the right to command every man.
And people read such words and then talk about their Christianity not being the belief of His divinity, but the practice of the Sermon on the Mount! His words are the foundation for every firm, lasting life. They are the basis of all true thought about God, ourselves, our duties, our future. 'That rock was Christ.' Every other foundation is as sand. Unless we build on Him, we build on changeable inclinations, short-lived desires, transitory aims, evanescent circumstances. Only the Christ who ever liveth, and is ever 'the same yesterday, and to-day, and for ever,' is fit to be the foundation of lives that are to be immortal.
Note the two houses built on the foundations. The metaphor suggests that each life is a whole with a definite character. Alas, how many of our lives are liker a heap of stones tilted at random out of a cart than a house with a plan. But there is a character stamped on every life, and however the man may have lived from hand to mouth without premeditation, the result has a character of its own, be it temple or pig-sty. Each life, too, is built up by slow labour, course by course. Our deeds become our dwelling-places. Like coral-insects, we live in what we build. Memory, habit, ever-springing consequences, shape by slow degrees our isolated actions into our abodes. What do we build?
One storm tries both houses. That may refer to the common trials of every life, but it is best taken as referring to the future judgment, when God 'will lay judgment to the line, and righteousness to the plummet'; and whatever cannot stand that test will be swept away. Who would run up a flimsy structure on some windy headland in northern seas? The lighthouses away out in ocean are firmly bonded into living rock. Unless our lives are thus built on and into Christ, they will collapse into a heap of ruin. 'Behold I lay in Zion for a foundation a stone, a tried stone, a precious corner stone, a sure foundation: he that believeth shall not make haste.'