Matthew 13:15

"For this people's heart has become calloused; they hardly hear with their ears, and they have closed their eyes. Otherwise they might see with their eyes, hear with their ears, understand with their hearts and turn, and I would heal them.'"

Hebrews 3:13

"But encourage one another daily, as long as it is called Today, so that none of you may be hardened by sin's deceitfulness."