In God "there is no variation or shadow due to change." 26 God is "HE WHO IS", from everlasting to everlasting, and as such remains ever faithful to himself and to his promises.

Catechism number 224

It means living in thanksgiving: if God is the only One, everything we are and have comes from him: "What have you that you did not receive?"48 "What shall I render to the LORD for all his bounty to me?"49

Official source ↗