Complete Works of Hippocrates

And what is small and what is large, what is many and what is few. And what is all in it as one, and all things that are one. And to understand and say the same things; and what, if necessary, one should neither understand, nor say, nor do. And what brings ease in it, and what brings difficulty. And what is timely, and what is untimely. And to what other arts it is similar, and to what it is not similar at all. And regarding the body, what is hot or cold, or dry or moist. And what is strong or weak, or dense or rare. And of the many things, which few occur, either toward the worse or toward the better. And what is done honorably or shamefully, or slowly or quickly, or correctly or incorrectly. And what evil necessarily arises upon evil. One must observe these things in discourse, considering how much someone deviates from these, either in speaking, or inquiring, or answering. And whether someone says that things which are many are few, and whether they assert that impossible things are possible. And whatever else someone might say in error, one must observe this, and in contradiction, one must approach and attack it.

II. Diseases therefore occur in everyone, some from things present in the body, from bile and phlegm; others from external causes, from labors and wounds. But also from the hot when it overheats, and from the cold when it overcools, and from the dry when it over-dries, and from the moist when it over-moistens. And indeed, bile and phlegm exist together when they are moved, and they are in the body, either more or less. Diseases are caused, in part, by foods and potions