Isaiah 38:3

Do you want to know the power of repentance? Do you want to understand this strong weapon of salvation and the might of confession? By confession Hezekiah routed 185,000 of the enemy. That was important, but it was small compared with what else happened. The same king's repentance won the repeal the sentence God had passed on him. When he was sick, Isaiah had said, "Give direction for your household, for you will surely die, and not live." What expectation was left? What hope of recovery was there? The prophet had said, "You will surely die." But Hezekiah remembered what was written: "In the hour that you turn and lament, you will be saved." He turned his face to the wall, and from his bed of pain his mind soared up to heaven (for no wall is so thick as to stifle fervent prayer). He said, "Lord, remember me." … He whom the prophet's sentence had forbidden to hope was granted fifteen further years of life, the sun turning back its course as a witness.

(Verse 3) I beseech thee, O Lord, remember how I have walked before thee in truth, and with a perfect heart, and have done that which is good in thy sight: and Hezekiah wept with great weeping. And he said: I beseech you, Lord, remember, please, how I have walked before you in truth, and with a perfect heart, and that I have done what is good in your eyes. And knowing that he is about to die, he does not pray for a long life and many years, but instead asks what he should offer in God's judgement. For he knew that Solomon pleased God because he did not ask for a longer life; but going to the Lord, he recounts his works, how he walked before Him in truth and with a perfect heart. Happy is the conscience that remembers good deeds during times of affliction: Blessed are the pure in heart, for they shall see God (Matthew 5:8). And when elsewhere it is written: Who shall glory in having a pure heart (Prov. XX, 9)? This is solved as follows: the perfection of the heart is now said to consist in the fact that it has destroyed idols, perverted the vessels of the temple of Baal, broken the brazen serpent, and done other things that Scripture mentions. However, he wept with great weeping because of the Lord's promise to David, which he saw would perish in his death. For at that time Hezekiah had no sons; for after his death, Manasseh, when he was twelve years old, began to reign in Judah. From which it is clear that three years after his life was granted, Manasseh was born. Therefore, all this weeping is because he despaired of Christ being born from his own seed. Others assert that even holy men are afraid of death due to uncertainty of judgement and ignorance of God's sentence, of which seat they will inhabit. And at the same time, the question of fate is resolved, and the bonds of necessity and causes, in that the day of death is by no means appointed to each individual, but rather someone may live or die by the will of God and unknown mortal causes, especially since the appointed necessity of death is now delayed, and we have read of many who were resurrected after death.