This is why Torah decreed following the prohibition of all these falsehoods that a person should maintain total faith in G-d. Rashba argues that everyday experience demonstrates the practical truth of specific attributes of herbs, gems and metals, that can assist in the healing process. Humanity developed this science of looking into the future because of its inborn anxiety of forthcoming events. The latter disagreement whether there is any truth in magical and mystic methods, is inseparable from the first argument whether practicing non-scientific medicine is permitted. It is obvious that present day science does not represent ultimate truth.
Empirical knowledge keeps changing, and consequently does theoretical science.
Once these methods improved, and it was shown that these procedures are of no value, it became forbidden to use them. It is therefore forbidden to practice it, as part of the general prohibition against idolatery. The exact same arguement covers astrology too. Had it possess real ability of looking into the future, it could not have been prohibited. According to Rashba science does not cover all reality, non-scientific medicine may indeed heal, and is not prohibited.