'Hardened' in the Bible

And Jesus having known, saith to them, 'Why do ye reason, because ye have no loaves? do ye not yet perceive, nor understand, yet have ye your heart hardened?

'He hath blinded their eyes, and hardened their heart, that they might not see with the eyes, and understand with the heart, and turn back, and I might heal them;'

and when certain were hardened and were disbelieving, speaking evil of the way before the multitude, having departed from them, he did separate the disciples, every day reasoning in the school of a certain Tyrannus.

What then? What Israel doth seek after, this it did not obtain, and the chosen did obtain, and the rest were hardened,

but their minds were hardened, for unto this day the same vail at the reading of the Old Covenant doth remain unwithdrawn -- which in Christ is being made useless --

but exhort ye one another every day, while the To-day is called, that none of you may be hardened by the deceitfulness of the sin,