“For if we had understanding, ought we to do any thing else both jointly and severally than to sing hymns and bless the deity, and to tell of his benefits?”
Epictetus links gratitude with attentive understanding: recognizing ordinary capacities and the order of life should produce praise rather than treating what sustains us as invisible or automatically deserved.
Source details
Discourses of Epictetus, Book I, Chapter XVI, “Of Providence,” George Long translation; 1877 George Bell & Sons witness on Wikisource, cross-checked against Project Gutenberg #10661. The passage is explicitly theological Stoicism: Epictetus says understanding should lead people to sing hymns, bless the deity and recount divine benefits.