Jung is saying that attaining consciousness—the Fall of Man—is a curse, which he later characterizes as our sacrifice to God, to help God develop self-reflection. The unspoken implication is that, insofar as the devil tricked Adam and Eve into taking a bite from the forbidden fruit, it was the devil who sacrificed humans, so as to render a service to his father. And since hatching such a plan must have required foresight—a capability unique to consciousness—presumably the devil had already sacrificed himself.
