If I were to stand in the pulpit and tell my pew-sitters to take the tenth leper as their model and be thankful, it would ignore how such thanks truly comes about.
Sunshine and rain, food and harvests, family, friends, and health, love and joy. All these things and more he gives, not because of what you do or don’t do, but because he is generous and gracious.
In the midst of our worship, God admonishes us to remember His goodness, and don't harden our hearts like our ancestors when they forgot God in the wilderness.