In the liturgy of a high festival that annually celebrated the LORD's cosmic rule (perhaps the Feast of Tabernacles), the Levites used Psalm 98 to call first the congregation at the temple (st. 1); then all the people of the earth (st. 2); and finally all creation (st. 2-3) to joyful praise of the LORD. This praise celebrates God's acts of redemption (st. 1) and God's future coming "in righteousness" (v. 9; st. 3).
Bert Polman, Psalter Hymnal Handbook
The best-loved expressions of praise for God’s care-taking work of his children comes from the familiar words of Heidelberg Catechism, Lord’s Day 1, Question and Answer 1: “My only comfort in life and death [is] that I am not my own, but belong—body and soul, in life and in death—to my faithful Savior, Jesus Christ. He has fully paid for all my sins with his precious blood, and has set me free from the tyranny of the devil...Because I belong to him, Christ by his Holy Spirit, assures me of eternal life and makes we wholeheartedly willing and ready from now on to live for him.”
This great truth is explained more completely by Belgic Confession, Article 20. God has given his Son to die for us “…by a most perfect love, and raising him to life for our justification, in order that by him, we might have immortality and eternal life.” And in Article 21, “…He endured all this for the forgiveness of our sins.” For this redemptive work we give praise and adoration.