They considered not the miracle of the loaves - They did not remember or call to mind the "power" which Jesus had shown in feeding the five thousand by a miracle, and that, having done that, he had power also to save them from the storm.

Their heart was hardened - Their "mind" was dull to perceive it. This does not mean that they were "opposed" to Jesus, or that they had what we denominate "hardness of heart," but simply that they were slow to perceive his power. They did not quickly learn, as they ought to have done, that he had all power, and could therefore allay the storm. The word "heart" is frequently used in this sense. See Ephesians 1:18, in Greek; Romans 1:21; Romans 2:15; 2 Corinthians 4:6.

Their heart was hardened - See this explained Matthew 14:33 (note).

For they considered not the miracle of the loaves,.... Which they had seen but the day before; they did not attend to it, nor learn from it, as they might, the wonderful glory of Christ, and the greatness of his power; which was as much an act of omnipotence, as either his walking upon the water, or causing the wind to cease, or more so.

For their heart was hardened; or "blinded"; not by sin, or against Christ, much less in a judicial way: but there was a great deal of dulness and stupidity, and want of attention in them. The glory of Christ, which he manifested, and showed forth in his miracles, was not so clearly and fully discerned, attended to, and acknowledged by them, at it might reasonably be thought it would; for notwithstanding these miracles, which they daily saw, they stood in need of divine illuminations, that the darkness of their minds being removed, they might behold the glory of Christ, as the glory of the only begotten of the Father.

Peculiar to Mark.

The miracle of the loaves (ἐπὶ τοῖς ἄρτοις)

Rev., concerning the loaves. Lit., upon ; in the matter of. They did not reason from the multiplying of the loaves to the stilling of the sea.

For they {z} considered not the miracle of the loaves: for their heart was hardened.

(z) Either they did not perceive, or had not well considered that miracle of the five loaves, to the point that the virtue of Christ was just as strange to them as if they had not been present at that miracle which was done just a little before.

6:52 Their heart was hardened - And yet they were not reprobates. It means only, they were slow and dull of apprehension.

52. For they considered not the miracle of the loaves; for their heart was hardened-What a singular statement! The meaning seems to be that if they had but "considered [reflected upon] the miracle of the loaves," wrought but a few hours before, they would have wondered at nothing which He might do within the whole circle of power and grace.

Incidents on Landing (Mr 6:53-56).

The details here are given with a rich vividness quite peculiar to this charming Gospel.

6:45-56 The church is often like a ship at sea, tossed with tempests, and not comforted: we may have Christ for us, yet wind and tide against us; but it is a comfort to Christ's disciples in a storm, that their Master is in the heavenly mount, interceding for them. And no difficulties can hinder Christ's appearance for his people, when the set time is come. He silenced their fears, by making himself known to them. Our fears are soon satisfied, if our mistakes are set right, especially our mistakes as to Christ. Let the disciples have their Master with them, and all is well. It is for want of rightly understanding Christ's former works, that we view his present works as if there never were the like before. If Christ's ministers now could cure people's bodily diseases, what multitudes would flock after them! It is sad to think how much more most care about their bodies than about their souls.