gratitude (updated)
cal. 460
It is reasonable to have gratitude. It is loving to have thankfulness.
"When you feel gratitude, you're pleased by what someone did for you and also pleased by the results." --vocabulary.com
Gratitude is recognized and expressed by the intellect. Thankfulness is a spiritual posture and way of being in the world.
gratitude to God
cal. 530
This is a specific application of gratitude that is beyond the intellect, having surrendered linear causation, i.e. "God works in mysterious ways" (the saying is at 530).