It is a good thing to give thanks unto the Lord
For all mercies, temporal and spiritual; for Christ, and salvation by him; for the Gospel, and for Gospel opportunities and ordinances; for, such days and seasons this psalm was composed for. It is "good" so to do, for it is the will of God that we should in and for every thing give thanks; it is due unto him, and is our reasonable service; it is well pleasing unto God through Christ; it is pleasant work for the saints themselves, and is profitable unto them; to be thankful for what they have is the way to have more. Kimchi connects this with the title; the sabbath day is good to give thanks unto the Lord; it is a very fit opportunity for such service; when a man is at leisure from worldly business, and his heart is engaged in spiritual exercises, and especially when it is warmed with the love of God:
and to sing praises unto thy name, O most High;
a name and epithet of God, suitable to his majesty and glory, to his supereminence over all his creatures, and the place where he dwells, and to whom the highest praises are due; these two phrases, giving thanks, and singing praise, are much the same; only with this difference, the former may be done in prayer, and without the modulation of the voice, as well as with it; the latter only with it; hence these two are mentioned as distinct things in ( Ephesians 5:19 Ephesians 5:20 ) .
F1 Zohar in Gen. fol. 43. 2. Vajikra Rabba, s. 10. fol. 153. 4. See the Targum in Cant. i. 1.