A physician who initiates treatment without proper diagnosis of the disease can accomplish the desired object only by chance (that is to say he cannot be sure of his success). The fact that he is well-acquainted with the knowledge of application of medicine does not necessarily guarantee his success.
On the other hand, the physician who is well-versed in diagnosing disease, who is proficient in the administration of medicines and who knows about modalities to be used in a therapy (that varies from place to place and season to season) is sure to accomplish the desired outcome without any doubt.
[Summary] In this chapter on major diseases, the enlightened sage has fully dealt with the following: classification of diseases, their nature, sites of manifestation,
primary and secondary causative factors, interchangeability and specific identity of disease, sites of dosha, enumeration of specific diseases due to dosha,