Charles Ellicott Commentary Isaiah 39:8

"Then said Hezekiah unto Isaiah, Good is the word of Jehovah which thou hast spoken. He said moreover, For there shall be peace and truth in my days." — Isaiah 39:8 (ASV)

Good is the word of the Lord ... —The words have the appearance of pious resignation, but we feel that they are less true and noble than those of David on a like occasion: “I have sinned and done wickedly; but these sheep, what have they done? Let thy hand, I pray thee, be against me, and against my father’s house” (2 Samuel 24:17). Hezekiah’s thanksgiving reminds us a little too much of “Après moi le déluge.”

Peace and truth. —The latter word is used in the sense of “stability” . The two words are used in the same way in Jeremiah 14:13, where we find “assured peace” in the text of the Authorized Version, and “peace of truth” in the margin.