Organon §19

Medicines cure by differently tuning a person's condition.

Since diseases are nothing other than alterations of condition in healthy people which express themselves through disease signs, and since cure is likewise only possible through an alteration of the patient's condition into the healthy state, then it is easily seen that medicines would in no way be able to cure if they did not possess the power to differently tune the human condition that resides in feelings and functions. Indeed, it is evident that the curative power of medicines must rest solely upon this, their power to alter the human condition.