46 And why call ye me, Lord, Lord, and do not the things which I say?
47 Whosoever cometh to me, and heareth my sayings, and doeth them, I will shew you to whom he is like:
48 He is like a man which built an house, and digged deep, and laid the foundation on a rock: and when the flood arose, the stream beat vehemently upon that house, and could not shake it: for it was founded upon a rock.
49 But he that heareth, and doeth not, is like a man that without a foundation built an house upon the earth; against which the stream did beat vehemently, and immediately it fell; and the ruin of that house was great.
1 Now when he had ended all his sayings in the audience of the people, he entered into Capernaum.
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For an adequate understanding of the Savior's words, it is important to imagine how houses were built in Judea, and in all Palestine, in Gospel times. The soil in most of Palestine is rocky; the powerful foundations needed when building on clay or sandy soils are not necessary there. It was only necessary to clear away the upper alluvial layer (usually thin enough) in order to reach the stone. After that, the simplest strip foundation was laid, its basis being large corner stones (cornerstones). But removing the upper layer was absolutely necessary; otherwise, in winter, during the rainy season, when turbulent streams flow from the mountains down the slopes into the valleys, the house would almost certainly "float."
The Savior, as we can see, compares spiritual life with a house that makes sense to build only on rock, after first clearing it of everything that can get in the way of construction. Clearly, the image of a house built on rock was meant to remind the listeners that listening and hearing are not the same thing. The one who has heard will certainly move from words to action, applying what he has heard in practice. But, of course, there will also be those who, after listening to everything, will not want to change anything in their life.
And this is no surprise: in spiritual life the main role is played not by intellect and not by feeling, but by the will. It is precisely through acts of will that the spiritual "I" of a person, which constitutes the center of the human person, manifests itself. But often the person himself does not realize this, at least when it comes to practical life. And he lives without realizing either the true causes or the true significance of his decisions and actions.
Such unexamined spiritual life really resembles a house built on sand: the acts of will that determine a person's spiritual life remain for the most part unconsidered, and often entirely unnoticed, so that a person, in a spiritual sense (and sometimes not only in a spiritual sense), literally lives without knowing how.
Any thought that unexpectedly comes to mind and any feeling that seizes the heart can lead to decisions and actions completely unexpected even for the person himself, decisions and actions that he often can neither understand nor explain. And only full awareness of every choice made and every decision taken makes a person's spiritual life (as well as his life in general) inwardly whole and consistent. In that case every action of the person comes from the depth of his spiritual "I." And his spiritual life turns out to be founded not on the shifting sand of random thoughts and feelings, but on the rock of conscious choice.