Self-knowledge is very much tied at the root ignorance that causes the primary defilements, which are in themselves the causes of obscured view (diseased thought), which start from a disease at the mental level and subsequently propagate to a disease in the psyche, the emotional level, and the physical level.
David Verdesi reveals how a process of self-knowledge can severe the problem at its root and in some cases cause a domino effect that triggers healing at multiple levels of our existence, often reaching all the way to the physical level which is the most gross aspect of our being and the one we can most easily perceive.
"When demons rule the Earth, they heal with knives
When humans rule the Earth, they heal with herbs
When angels rule the Earth, they heal with songs"
- Sufi saying