Treasury of Scripture Knowledge
Summary
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.
And hardened
Bible References
Why
2 Thessalonians 2:11
This is why God sends them a misleading influence till they actually believe what is false,
And hardened
John 12:40
"He has blinded their eyes and benumbed their hearts, so that they cannot see with their eyes and understand with their hearts, and turn to me to cure them."
Romans 9:18
So He has mercy on any man that He chooses to, and He hardens any man that He chooses to harden.