Another thing, give thanks to the Lord, for He is good; for His mercy endures forever. This is what the scripture says (Isaiah 12:1), "And in that day you shall say, 'O Lord, I will praise You; Though You were angry with me, Your anger is turned away, and You comfort me." The children of Israel should only say gratitude to the Lord for all the goodness that He does with them, as it is said (ibid. 25:1), "O Lord, You are my God, I will exalt You, I will praise Your name, for You have done wonderful things; Your counsels of old are faithfulness and truth."
When David saw how good thanksgiving was, he said, "Give thanks to the Lord, for He is good." Since thanksgiving is good, he said this. Similarly, it says (Proverbs 28:13), "He who covers his sins will not prosper, but whoever confesses and forsakes them will have mercy." And it says (Psalms 32:5), "I acknowledged my sin to You, and my iniquity I have not hidden.
I said, 'I will confess my transgressions to the Lord,' and You forgave the iniquity of my sin." And it also says (ibid. 92:2), "It is good to give thanks to the Lord." Therefore, give thanks to the Lord, for He is good.