Discussing Aristotle‘s definition of God as “noesis of itself“, “a thinking that thinks itself“, Castoriadis remarks that this view is in accord with Aristotle’s horizon, where being is pure energy, form (eidos) without matter (cf. Castoriadis, Crossroads in the Labyrinth, Prologue).
There are more than this involved here. Aristotle explains his definition further, saying that God thinks Himself because He is the most powerful (kratistos). For Aristotle, then, thinking must be blind to the less powerful; we leave behind us whatever has less value, and the most valuable casts a shadow over everything.