Psalm 34:8 is not a call to feel warmly about God but to test his goodness by taking refuge in him. The psalm roots that goodness in God's real rescue of the poor, not in a promise of an easy life.

Psalm 100:1–5 calls all lands to joyful service and thankful worship because Yahweh is God, he made us, and he is good. A thirty day study trains us to return to these reasons, not to manufacture gratitude from circumstances.