4 Bible Verses about Obstinacy Against God

Jesus, being aware of what they were thinking, said, "Why are you reasoning about not having any bread? Have you not yet perceived or understood? Have your hearts become insensitive? Even though you have eyes, do you not see? And even though you have ears, do you not hear? And do you not remember? When I divided the five loaves of bread among the five thousand persons, how many baskets full of broken pieces did you gather up?" They said to Him, "Twelve baskets full."read more.
He again asked, "And when the seven loaves were divided among the four thousand persons, how many large basketfuls of broken pieces did you gather up?" And they said to Him, "Seven large basketfuls." Then He said to them, "Do you not understand yet?"

You people are unbending and unrepentant in your hearts and [unwilling to listen with] your ears. You are always resisting [the desires of] the Holy Spirit just like your forefathers did.

But Isaiah said about the Israelites [Isa. 40:2], "I reached out all day long to [help] people who disobeyed and spoke against [me]."

[Now] we have many things to say about Melchizedek, but because of your slowness to grasp things, they are hard to explain. For certainly enough time has elapsed so that [by now] you ought to be teachers, [but instead] you are in need of having someone teach you again the basic principles of God's message. You have become people who need "milk" and not "solid food." [Note: The fundamental truths of Christianity are here figuratively spoken of as "milk," while the more advanced teaching, such as Christ's priesthood being like Melchizedek's, is called "solid food"]. For everyone who has to drink "milk" is inexperienced in the teaching about righteousness, for he is [still] a [spiritual] baby.read more.
But "solid food" is for mature people, who because of using their [spiritual] senses, have become able to distinguish good from evil.