Deuteronomy 29:4
"Yet the LORD hath not given you an heart to perceive, and eyes to see, and ears to hear, unto this day."
Cross References (ranked by relevance)
Having the understanding darkened, being alienated from the life of God through the ignorance that is in them, because of the blindness of their heart:
The hearing ear, and the seeing eye, the LORD hath made even both of them.
Why do ye not understand my speech? even because ye cannot hear my word.
O LORD, why hast thou made us to err from thy ways, and hardened our heart from thy fear? Return for thy servants’ sake, the tribes of thine inheritance.
A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh.
But even unto this day, when Moses is read, the vail is upon their heart.
But Sihon king of Heshbon would not let us pass by him: for the LORD thy God hardened his spirit, and made his heart obstinate, that he might deliver him into thy hand, as appeareth this day.
In meekness instructing those that oppose themselves; if God peradventure will give them repentance to the acknowledging of the truth;