1.

Bless the LORD, O my soul: and all that is within me, bless his holy name.

Title. of David: i.e. relating to the true David.
Bless. Figure of speech Apostrophe.
the LORD. Hebrew. Jehovah. with ' eth = Jehovah Himself.
my soul = me myself. Hebrew. nephesh. App-13 .
holy. See note on Exodus 3:5 .
name. See note on Psalms 20:1 .

2.

Bless the LORD, O my soul, and forget not all his benefits:

all = any of.
benefits = dealings.

3.

Who forgiveth all thine iniquities; who healeth all thy diseases;

forgiveth = passeth over. This verb, with its adjective and subs., is never used but of God. Literal. That is the Forgiver. Compare Psalms 103:14 and note there.
iniquities. Hebrew. 'avah. So some codices, with one early printed edition, Septuagint and Vulgate (plural); other codices read singular.

4.

Who redeemeth thy life from destruction; who crowneth thee with lovingkindness and tender mercies;

redeemeth: i.e. as a kinsman. Hebrew. ga'al. See note on Exodus 6:6 .
tender mercies = compassions.

5.

Who satisfieth thy mouth with good things; so that thy youth is renewed like the eagle's.

6.

The LORD executeth righteousness and judgment for all that are oppressed.

The LORD. Hebrew. Jehovah. App-4 .

7.

He made known his ways unto Moses, his acts unto the children of Israel.

ways: i.e. the reasons of His acts (esoteric) to Moses. acts: i.e. the acts (exoteric) visible to the People.
children = sons.

8.

The LORD is merciful and gracious, slow to anger, and plenteous in mercy.

merciful = compassionate, or pitiful. Compare Psalms 103:13 .
Slow to anger = long-suffering.
mercy = lovingkindness, or grace. Compare Exodus 34:6 , Exodus 34:7 .

9.

He will not always chide: neither will he keep his anger for ever.

His anger. The Ellipsis is correctly supplied from the preceding line.

10.

He hath not dealt with us after our sins; nor rewarded us according to our iniquities.

sins. Hebrew. chata. App-44 .

11.

For as the heaven is high above the earth, so great is his mercy toward them that fear him.

great = mighty, or hath prevailed.
toward = upon.
fear = revere.

12.

As far as the east is from the west, so far hath he removed our transgressions from us.

transgressions. Hebrew. pasha'. App-44 .

13.

Like as a father pitieth his children, so the LORD pitieth them that fear him.

14.

For he knoweth our frame; he remembereth that we are dust.

frame = formation. He remembereth. Compare Isaiah 29:16 ; Isaiah 45:9 , Isaiah 45:10 : i.e. God remembers what man forgets (i.e. our infirmities); and He forgets what man remembers (i.e. our sins). See Isaiah 43:25 ; Isaiah 44:22 .Jeremiah 31:34 . Compare Isaiah 55:8 .
dust. See Genesis 2:7 ; Genesis 3:19 . Ecclesiastes 12:7 .

15.

As for man, his days are as grass: as a flower of the field, so he flourisheth.

man. Hebrew. 'enosh. App-14 .

16.

For the wind passeth over it, and it is gone; and the place thereof shall know it no more.

wind. Hebrew. ruach. App-9 .
it is gone = there is no sign of it.
the place . . . know it. Figure of speech Prosopopoeia.
know = recognize.

17.

But the mercy of the LORD is from everlasting to everlasting upon them that fear him, and his righteousness unto children's children;

But. Blessed contrast.

18.

To such as keep his covenant, and to those that remember his commandments to do them.

19.

The LORD hath prepared his throne in the heavens; and his kingdom ruleth over all.

prepared = established.

20.

Bless the LORD, ye his angels, that excel in strength, that do his commandments, hearkening unto the voice of his word.

ye. Some codices, with Septuagint and Vulgate, read "all ye".
That excel = That are mighty.
commandments = commandment (singular)

21.

Bless ye the LORD, all ye his hosts; ye ministers of his, that do his pleasure.

ministers: i.e. the angels. Compare Psalms 104:4 .Hebrews 1:14 .

22.

Bless the LORD, all his works in all places of his dominion: bless the LORD, O my soul.

dominion = sovereignty.