'Hardened' in the Bible

for they understood not concerning the loaves, but their heart was hardened.

And Jesus perceiving it saith unto them, Why reason ye, because ye have no bread? do ye not yet perceive, neither understand? have ye your heart hardened?

He hath blinded their eyes, and he hardened their heart; Lest they should see with their eyes, and perceive with their heart, And should turn, And I should heal them.

But when some were hardened and disobedient, speaking evil of the Way before the multitude, he departed from them, and separated the disciples, reasoning daily in the school of Tyrannus.

What then? that which Israel seeketh for, that he obtained not; but the election obtained it, and the rest were hardened:

but their minds were hardened: for until this very day at the reading of the old covenant the same veil remaineth, it not being revealed to them that it is done away in Christ.

but exhort one another day by day, so long as it is called To-day; lest any one of you be hardened by the deceitfulness of sin: