And he said unto them, (c) How is it that ye do not understand?
(c) How does it come to pass that you do not understand these things which are so plain and evident.

And he said unto them,.... Since this was the case, and they so well remembered the miracles he had wrought, and the circumstances of them:
how is it that ye do not understand? my words concerning the leaven of the Pharisees, of the Sadducees, and of Herod, as to imagine I spoke of bread, taken in a literal sense; or that I concerned myself about the scantiness of your provisions, when you, might have learnt from my late miracles, how able I am to support you, if you had not so much as one loaf with you: wherefore it argues great want both of understanding and faith, and shows great stupidity, ignorance, and unbelief, to give such a sense of my words, and to be anxiously concerned on the score of your provisions.

How is it that ye do not understand?--"do not understand that the warning I gave you could not have been prompted by any such petty consideration as the want of loaves in your scrip." Profuse as were our Lord's miracles, we see from this that they were not wrought at random, but that He carefully noted their minutest details, and desired that this should be done by those who witnessed, as doubtless by all who read the record of them. Even the different kind of baskets used at the two miraculous feedings, so carefully noted in the two narratives, are here also referred to; the one smaller, of which there were twelve, the other much larger, of which there were seven.
Blind Man at Bethsaida Restored to Sight (Mark 8:22-26).