Вразумились

52 и́бо не вразумились [чудом] над хлебами,

52 [for, because] [never, not] вразумились [чудом] above bread,

потому́ что се́рдце их бы́ло окаменено́.

[because, that is why, therefore] [what, that, why] [heart, hearts] [them, their] [it was, was] [hardened, petrified].

for they did not understand about the loaves,
but their hearts were hardened.
Mark 6:52 ESV

For they considered not the miracle of the loaves:
for their heart was hardened.
Mark 6:52 KJV