Commentaries:
Barnes' Notes
Thou art my portion, O Lord - This begins a new division of the psalm, indicated by the Hebrew letter Cheth ( ch ), which may be represented in English by "ch." On the meaning of the language here, see the notes at Psalms 16:5. God was to him what other people seek in wealth, honor, pleasure, fame. To him, God was all and in all. He asked nothing else.
I have said - I have formed the purpose, and have expressed it. It is the deliberate and settled design of my life.
That I would keep thy words - That I would obey thee at all times; that I would keep all thy commandments.
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