VI. Diphtheria and Influenza—Crossed Eyes

Aside from this life proceeding from the outside in, there is also a life going from inside out, particularly from the kidneys. Both must be active in the human being. Activity both from the skin inward and from the kidneys outward must be at work. The heart occupies a position in between and is highly sensitive to too much activity from outside or inside. The heart can sense when the kidneys begin to be overly active, and it also senses when the skin's activity begins to be too strong or too weak.