I will walk humbly all my years because of this anguish of my soul

Isaiah 38:1-22
Hezekiah's illness.
Hezekiah turned his face to the wall and prayed to the Lord. Then the word of the Lord came to Isaiah: Go and tell Hezekiah, 'This is what the Lord, says: I have heard your prayer and seen your tears; I will add fifteen years to your life. And I will deliver you and this city from the hand of the king of Assyria. I will defend this city.'
A writing of Hezekiah king of Judah after his illness and recovery.:..But what can I say? He has spoken to me, and he himself has done this. I will walk humbly all my years because of this anguish(痛苦) of my soul. Lord, by such things people live; and my spirit finds life in them too. You restored me to health and let me live. Surely it was for my benefit that I suffered such anguish. In your love you kept me from the pit of destruction; In your love you kept me from the pit of destruction; you have put all my sins behind your back. For the grave cannot praise you, death cannot sing your praise; those who go down to the pit cannot hope for your faithfulness. The living, - they praise you, as I am doing today. The Lord will save me, and we will sing with stringed instruments all the days of our lives in the temple of the Lord.
Why?
Once again God listen to the prayer of Hezekiah's pray. For his deeply pray and he wept a lot before the Lord and he did many things to turn his people back to the Lord and erase the idols in his country.
Actions and faith and deeply regression is the key to pray to the Lord.
Hezekiah said the same word as David said "For the grave cannot praise you, death cannot sing your praise"
I will walk humbly all my years because of the great grace come upon me.
.How?
Praise to the Lord all days of my year, I will sing with instruments before the Lord.