He is like a man, etc. - See on Matthew 7:24-27 (note).

He is like a man which built an house,.... That is, intended to build one, having drawn the scheme of it in his mind, and provided materials, and fixed upon the spot of ground:

and digged deep, and laid the foundation on a rock; that is, he dug deep in the earth, till he came at a rock, and there, and then, he laid the foundation of his house; in which he acted the part of a wise man, as he is called in Matthew: so a sensible sinner, desirous of building his soul, and the salvation of it, on a sure bottom, digs deep into the Scriptures, diligently searches them, till he finds out the scheme of salvation by Christ; which lies deep in God's counsel and covenant, was ordained before the world began, and was hid in God till revealed in the Gospel: and finding Christ to be the rock of ages, in whom is everlasting strength, and the foundation which God has laid, nor is there another; he makes use of him as such, and builds the hope of his eternal salvation on him:

and when the flood arose; an inundation, a multitude of waters, the swelling of the sea; or rather "when it was tide", as the word here used signifies (k):

the stream beat vehemently upon the house; or the river, up which the tide came, dashed and broke against it; by which may be signified the temptations of Satan, the persecutions of the world, the corruptions of men's hearts, and the errors and heresies of false teachers:

and could not shake it; as none of these can so shake as to move a soul, thus built on Christ, off of him the foundation:

for it was founded upon a rock; See Gill on Matthew 7:24. See Gill on Matthew 7:25.

(k) Vid. Rivinum de Venilia Salacia, &c. p. 681, 632.

Digged deep (ἔσκαψεν καὶ ἐβάθυνεν)

The A. V. regards the two words as a strong expression of a single idea; but the idea is twofold: he dug (through the sand), and deepened down into the solid rock. So Rev., rightly, he digged and went deep.

The flood (πλημμύρας)

There is no article: a flood. The word occurs in Luke only, and only in this passage. As a medical term it is used of excess of fluids in the body: flooding.

Beat vehemently (προσέῤῥηξεν)

Rev., more literally, brake. Used by physicians of a rupture of the veins. It occurs only here and Luke 6:49. Matthew has προσέκοψαν, beat.

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.

6:48 Digged deep. Luke adds. This is often needful to reach the rock. We must dig deep, even to our heart, to its center, to build upon the Rock, Christ our Lord. The confession of faith in Christ must be believed with the heart (Ro 10:10), confessed with the mouth, in order that we may be built upon the Rock (Mt 16:18).

6:37-49 All these sayings Christ often used; it was easy to apply them. We ought to be very careful when we blame others; for we need allowance ourselves. If we are of a giving and a forgiving spirit, we shall ourselves reap the benefit. Though full and exact returns are made in another world, not in this world, yet Providence does what should encourage us in doing good. Those who follow the multitude to do evil, follow in the broad way that leads to destruction. The tree is known by its fruits; may the word of Christ be so grafted in our hearts, that we may be fruitful in every good word and work. And what the mouth commonly speaks, generally agrees with what is most in the heart. Those only make sure work for their souls and eternity, and take the course that will profit in a trying time, who think, speak, and act according to the words of Christ. Those who take pains in religion, found their hope upon Christ, who is the Rock of Ages, and other foundation can no man lay. In death and judgment they are safe, being kept by the power of Christ through faith unto salvation, and they shall never perish.