Commentaries:
Jamieson, Fausset, and Brown
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, etc., Exodus 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" (Genesis 5:24; I Kings 9:4).
perfect—sincere; not absolutely perfect, but aiming towards it (Matthew 5:45); single-minded in walking as in the presence of God (Genesis 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; II Corinthians 3:6, II Corinthians 3:14, II Corinthians 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 (II Kings 23:26-27).
Other Jamieson, Fausset, and Brown entries containing Isaiah 38:3:
Daniel 4:27
Matthew 5:8
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