4 Bible Verses about Obstinacy Against God

He perceived what they were saying, and He said to them, "What is this discussion of yours about having no bread? Do you not yet see and understand? Are your minds so dull of comprehension? You have eyes! can you not see? You have ears! can you not hear? and have you no memory? When I broke up the five loaves for the 5,000 men, how many baskets did you carry away full of broken portions?" "Twelve," they said.read more.
"And when the seven for the 4,000, how many hampers full of portions did you take away?" "Seven," they answered. "Do you not yet understand?" He said.

"O stiff-necked men, uncircumcised in heart and ears, you also are continually at strife with the Holy Spirit--just as your forefathers were.

While as to Israel he says, "All day long I have stretched out My arms to a self-willed and fault-finding people."

Concerning Him we have much to say, and much that it would be difficult to make clear to you, since you have become so dull of apprehension. For although, considering the long time you have been believers, you ought now to be teachers of others, you really need some one to teach you over again the very rudiments of the truths of God, and you have come to require milk instead of solid food. By people who live on milk I mean those who are imperfectly acquainted with the teaching concerning righteousness.read more.
Such persons are mere babes. But solid food is for adults--that is, for those who through constant practice have their spiritual faculties carefully trained to distinguish good from evil.