أي الذات الواجب الوجود الذي يكون وجوده من ذاته
That is, the being necessarily existent, whose existence belongs to His very essence.
The Necessary Existent in Himself cannot fail to exist and does not receive existence from an external cause. “From His essence” does not mean that He brings Himself into existence at some moment; self-production would presuppose the very nonexistence and origination excluded by necessity.
A contingent thing, by contrast, does not possess existence as an intrinsic necessity of its essence. This distinction anchors the ensuing discussion of causal dependence.