for they had not understood about the loaves; their hearts were hardened.
OJBFor they did not have binah concerning the loaves, but their levavot (hearts) had been hardened.
TCENTfor they did not understand the significance of what had happened with the loaves, because their hearts were hardened.
T4TAlthough they had seen Jesus multiply the bread and the fish, they did not understand from that how powerful he was, as they should have. They did not think clearly about it.