"Give thanks in all circumstances; for this is the will of God in Christ Jesus for you." 1 Thess. 5:18
Gratefulness breeds happiness. Ungratefulness breeds anger which breeds unhappiness.
"Oh give thanks to the Lord, for he is good, for his steadfast love endures forever!” Ps. 107:1
The fact that God’s love endures forever is reason enough to be grateful. His love will out-endure our pain and suffering, our old age, our financial state, and all our earthly problems. He loves us through it all, even when we’re unlovable.
"Thanks be to God for his inexpressible gift!” 2 Cor. 9:15