祝由, on this desk, is not offered as medicine. The historical practice has been tangled with healing claims. Tao Reading keeps a narrower object: a short, repeatable sitting built around an intention such as work, calm, study, or kindness, a public-domain sentence from Legge's Laozi or Analects, and an explanation that promises nothing.
The steps are deterministic. The same intention and the same seed produce the same sitting, the way a cast produces the same hexagram. That is a feature. A ritual you can repeat is closer to a habit of attention than to a spell.
If the intention asks for a cure, a treatment, or relief from illness, the desk stops and says so. Rewrite it as calm, patience, or companionship if you want a sitting, and talk to a clinician about health. The blessing card may carry a watermark until a paid desk removes it. The watermark is not a curse. It marks a free copy.