The first is, that you do know how to prepare well all your things, and that you do know how to remove that which doth hurt most, and that which doth comfort your Intention, and that you know the sign when you have that which you desire to have, and that you know how to remove that which you ought to remove.
“Speculum Alchymiae” by Bacon, 1250
This process of affusion and extraction must be repeated until all the salt, or potency and efficacy, has been extracted from the body. This is the case when the water becomes white and thick, and, in the cold, hard and solid like ice, while in the heat it melts like butter. Now, when nothing more can be extracted from the body, the residuum must be removed; for it is the superfluous part of the substance. This is what the Sages mean when they say: In the preparation we remove that which is superfluous.
“The Glory Of The World”, 1620