“Atonement does not heal the sick, for that is not a cure. It takes away the guilt that makes the sickness possible. And that is cure indeed. (WB-140)”
Atonement takes away guilt, and A Course in Miracles indicates that it is our guilt that causes our sicknesses. This does not mean that if we get rid of all the guilt, we will necessarily be healed of all afflictions; this would be magical thinking. Some illnesses persist, and we need not blame our sicknesses on our “failure” to achieve a guilt-free existence. That would be very close to blaming the victim, which is an inaccurate way of reading ACIM.
When we take away the guilt, though, we are less likely to experience new sicknesses. And what we have may decline and eventually disappear. This will seem a miracle, and indeed it is. Jesus speaks in an ideal mode when making these assertions; we are very fallible, and we may not be able to rise to his ideal.
The cure comes when we do get rid of the guilt. Our minds are cured, and that is cure indeed. Physical symptoms may persist; indeed, may never go away. But with a healed mind, we can deal with anything. Our way is clear; we live successfully even in the face of debilitations and handicaps.