'Hardens' in the Bible

Blessed and favored by God is the man who fears [sin and its consequence] at all times,But he who hardens his heart [and is determined to sin] will fall into disaster.

He who hardens his neck and refuses instruction after being often reproved (corrected, criticized),Will suddenly be broken beyond repair.

So then, He has mercy on whom He wills (chooses), and He hardens [the heart of] whom He wills.