Letter 78 — On the Healing Power of the Mind (§8)

“The severest pains have their seat in the most slender parts of our body; nerves, joints, and any other of the narrow passages, hurt most cruelly when they have developed trouble within their contracted spaces. But these parts soon become numb, and by reason of the pain itself lose the sensation of pain, whether because the life-force, when checked in its natural course and changed for the worse, loses the peculiar power through which it thrives and through which it warns us, or because the diseased humours of the body, when they cease to have a place into which they may flow, are thrown back upon themselves, and deprive of sensation the parts where they have caused congestion.”