In his first letter to early Christian believers, the apostle John writes an exposition on righteousness and love as essential requirements for Christian living. In the midst of this exposition we find I John 3: 1-3, a declaration of awe and praise for God's wondrous grace in making us his children. Based on this passage,
"How Great Is the Love of the Father" describes how we become children of God (st. 1); how we should live as children of God (st. 2); and what we shall become in glory as children of God (st. 3).
Bert Polman, Psalter Hymnal Handbook
The Catechism says that those who know Christ’s forgiveness are “to thank God for such deliverance” (Heidelberg Catechism, Lord’s Day 1, Question and Answer 2). As a result, “With our whole lives we may show that we are thankful to God for his benefits, so that he may be praised through us, and that we may be assured of our faith by its fruits, and so that by our godly living our neighbors may be won over to Christ” (Heidelberg Catechism, Lord’s Day 32, Question and Answer 86).