No heart shall beat, no foot shall press, no hand Strain, strive, and strike with steadier will than mine And faith more strenuous toward the purpose. Algernon Charles Swinburne
You have to believe in a placebo or it won't work, but if it works, it's obviously working in some indirect way, through feedback in the immune system, let us say, or in the willpower of the patient to take a more strenuous exercise in their own therapy. Charles Jencks