"The Being of beings is represented fundamentally, in the sense of the ground, only as causa sui. This is the metaphysical concept of God... The cause as causa sui. This is the right name for the god of philosophy." In thinking "God" as causa sui, metaphysics gives itself a concept of "God" that at once marks the indisputable experience of him and his equally incontestable limitation; by thinking "God" as an efficiency so absolutely and universally foundational that it can be conceived only starting from the foundation, and hence finally as the withdrawl of the foundation into itself, metaphysics indeed constructs for itself an apprehension of the transcendence of God, but under the figure simply of efficency, of the cause, and of the foundation. Such an apprehension can claim legitimacy only on condition of also recognizing its limit. Heidegger draws out this limit very exactly: "Man can neither pray nor sacrifice to this God. Before the causa sui, man can neither fall to his knees in awe nor can he play music and dance before this god.
-Jean-Luc Marion, God Without Being