There is an Evangelistic element that runs through this poem. I find it similar to the Great Commission passages of the New Testament. Notice the introductory words of v 2, "Let the redeemed of the Lord say so. Also, take note of the refrain in the Psalm, "Let them give thanks to the LORD for His lovingkindness, And for His wonders to the sons of men!" (8, 15, 21, & 31) I see this sentiment repeated throughout Scripture. A couple of examples: