Charles H. Spurgeon on Psalms 118:29

O give thanks unto the LORD; for he is good: for his mercy endureth for ever. The Psalm concludes as it began, making a complete circle of joyful adoration. We can well suppose that the notes at the close of the loud hallelujah were more swift, more sweet, more loud than at the beginning. To the sound of trumpet and harp, Israel, the house of Aaron, and all that feared the Lord, forgetting their distinctions, joined in one common hymn, testifying again to their deep gratitude to the Lord's goodness, and to the mercy which is unto eternity. What better close could there be to this right royal song? The Psalmist would have risen to something higher, so as to end with a climax, but nothing loftier remained. He had reached the height of his grandest argument, and there he paused. The music ceased, the song was suspended, the great hallel was all chanted, and the people went every one to his own home, quietly and happily musing upon the goodness of the Lord, whose mercy fills eternity.