My meditation of him shall be sweet - That is, I will find pleasure in meditating on his character and works. See the notes at Psalms 1:2. It is one of the characteristics of true piety that there is a “disposition” to think about God; that the mind is “naturally” drawn to that subject; that it does not turn away from it, when it is suggested; that this fills up the intervals of business in the day-time, and that it occupies the mind when wakeful at night. Psalms 63:6. It is also a characteristic of true piety that there is “pleasure” in such meditations; happiness in thinking of God. The sinner has no such pleasure. The thought of God is painful to him; he does not desire to have it suggested to him; he turns away from it, and avoids it. Compare the notes at Isaiah 30:11. It is one of the evidences of true piety when a man “begins” to find pleasure in thinking about God; when the subject, instead of being unpleasant to him, becomes pleasant; when he no longer turns away from it, but is sensible of a desire to cherish the thought of God, and to know more of him.
I will be glad in the Lord - That is, I will rejoice that there is such a Being; I will seek my happiness in him as my God.