Isa 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, 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.”

“He mentions his past religious consistency, not as a boast or a ground for justification; but according to the Old Testament dispensation, wherein temporal rewards (as long life, &c., Exo 20:12) followed legal obedience, he makes his religious conduct a plea for asking the prolongation of his life. walked--Life is a journey; the pious "walk with God" (Gen 5:24; Kg1 9:4). perfect--sincere; not absolutely perfect, but aiming towards it (Mat 5:45); single-minded in walking as in the presence of God (Gen 17:1). The letter of the Old Testament legal righteousness was, however, a standard very much below the spirit of the law as unfolded by Christ (Mat. 5:20-48; Co2 3:6, Co2 3:14, Co2 3:17). wept sore--JOSEPHUS says, the reason why he wept so sorely was that being childless, he was leaving the kingdom without a successor. How often our wishes, when gratified, prove curses! Hezekiah lived to have a son; that son was the idolater Manasseh, the chief cause of God's wrath against Judah, and of the overthrow of the kingdom (Kg2 23:26-27).”