How can a hymn not be grateful for the original song?

Christians. The hymn "How Can You Be Ungrateful" was originally sung as a Christian. Lyrics: You know me, pity me. You miss me and surround me with love. You didn't treat me according to my fault, but accepted me unconditionally. You forgive me and purify me. You healed me and wrapped me in love. You hold me in your arms and enjoy your abundant grace. My heart should be grateful. My mouth, praise those who have tasted the wonderful love of God. Why not be grateful from the heart and taste God?