While this confusion has roots in immunology’s early vocabulary of selfhood, the idea that disease is a physical expression of a metaphysical condition is not new. It is deeply embedded in Western Judeo-Christian thinking, going back at least to the Christian notion that illness is entangled with sin: “Confess your faults one to another, and pray for one another, that ye may be healed,” we read in James 5:16. Christianity saw illness as a sign of spiritual taint—a metaphor for sin. In the Gospel, the sick are healed when they accept faith. Our word “pain” is from the Latin poena, or “penalty,”
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