ου 3756 PRT-N γαρ 1063 CONJ συνηκαν 4920 5656 V-AAI-3P επι 1909 PREP τοις 3588 T-DPM αρτοις 740 N-DPM ην 2258 5713 V-IXI-3S γαρ 1063 CONJ η 3588 T-NSF καρδια 2588 N-NSF αυτων 846 P-GPM πεπωρωμενη 4456 5772 V-RPP-NSF
Vincent's NT Word Studies
52. Peculiar to Mark.The miracle of the loaves (epi toiv artoiv). 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.
Robertson's NT Word Studies
6:52 {For they understood not} (ou gar sunekan). Explanation of their excessive amazement, viz., their failure to grasp the full significance of the miracle of the loaves and fishes, a nature miracle. Here was another, Jesus walking on the water. Their reasoning process (kardia in the general sense for all the inner man) {was hardened} (en pepwrwmene). See on 3:5 about pwrwsis. Today some men have such intellectual hardness or denseness that they cannot believe that God can or would work miracles, least of all nature miracles.