النِّعْمَةُ فِي القُدْرَةِ
Using “favor/benefit” to mean the power that produces it.
A favor or benefit is an effect made possible by capacity or power. When the name of that benefit is used for the power generating it, the effect is named in place of its cause.
This direction differs from “hand → favor,” where an instrument or cause is named to signify its resulting benefit. Keeping the direction of transfer explicit is essential: cause-to-effect and effect-to-cause are different relations, even though both belong to majāz mursal.