From the ACIM Manual For Teachers, “The structure of ‘individual consciousness’ is essentially irrelevant because it is a concept representing the ‘original error’ or the ‘original sin’. To study the error itself does not lead to correction, if you are indeed to succeed in overlooking the error. And it is just this process of overlooking at which this course aims.”
Everything in the material world is an effect of the original error, and thus teachers of God have learned to overlook the belief in analyzing only the material. Studying the effects of the error without the intention to show they are not real is teaching/learning ego.
To study the body does not lead to correction, but to overlook its limitations does. To study only the physical universe does not lead to correction of views about it being separate from nonlinear Source, but to overlook the idea of separation does. To study the ego does not lead to correction, but to overlook it does. To study the world does not lead to correction, but to overlook it does. To study theology does not lead to correction, but to overlook it does.
Indeed, nothing in the material world, the effect of the “original error”, can lead to correction, unless it is overlooked.
“The ego will demand many answers that this course does not give. It does not recognize as questions the mere form of a question to which an answer is impossible. The ego may ask, ‘How did the impossible occur?’, ‘To what did the impossible happen?’, and may ask this in many forms. Yet there is no answer; only an experience. Seek only this, and do not let theology delay you.” (ACIM)