Jeremiah 5:3

O Lord, are not Thine eyes upon the truth? Does not Jehovah seek faithfulness and sincerity in all things? Is He not ever the God of truth? Thou hast stricken them, but they have not grieved, they do not feel the pain, the punishment makes no impression upon them; Thou hast consumed them, destroying them as a nation, but they have refused to receive correction, to accept the Lord's discipline; they have made their faces harder than a rock; they have refused to return. Such is the perversity of deliberate wrong-doing that it hardens the heart of the sinner against every influence for good, producing such a degree of callousness that every effort of the Lord is vain. It is in such cases that His judgment of hardening the heart of the sinner is often enacted.