Hippocrates, On the Epidemics, Book 1, Section 2, Paragraph 5:
With regard to the dangers of these cases, one must always attend to the seasonable concoction of all the evacuations, and to the favorable and critical abscesses. The concoctions indicate a speedy crisis and recovery of health; crude and undigested evacuations, and those which are converted into bad abscesses, indicate either want of crisis, or pains, or prolongation of the disease, or death, or relapses; which of these it is to be must be determined from other circumstances. The physician must be able to tell the antecedents, know the present, and foretell the future--must mediate these things, and have two special objects in view with regard to disease, namely, to do good or to do no harm. The art consists in three things- the disease, the patient, and the physician. The physician is the servant of the art, and the patient must combat the disease along with the physician.
With regard to the dangers of these cases, one must always attend to the seasonable concoction of all the evacuations, and to the favorable and critical abscesses. The concoctions indicate a speedy crisis and recovery of health; crude and undigested evacuations, and those which are converted into bad abscesses, indicate either want of crisis, or pains, or prolongation of the disease, or death, or relapses; which of these it is to be must be determined from other circumstances. The physician must be able to tell the antecedents, know the present, and foretell the future--must mediate these things, and have two special objects in view with regard to disease, namely, to do good or to do no harm. The art consists in three things- the disease, the patient, and the physician. The physician is the servant of the art, and the patient must combat the disease along with the physician.