Elementary Quotes - page 13
More than one pathologist, chemist, homeopathist, and magnetist has quenched his thirst for knowledge in the books of Paracelsus. Frederick Hufeland got his theoretical doctrines on infection from this mediaeval "quack,” as Sprengel delights in calling one who was immeasurably higher than himself. Hemman, who endeavors to vindicate this great philosopher, and nobly tries to redress his slandered memory, speaks of him as the "greatest chemist of his time." So do Professor Molitor, J and Dr. Ennernoser, the eminent German psychologist. According to their criticisms on the labors of this Hermetist, Paracelsus is the most wondrous intellect of his age,” a " noble genius.” But our modern lights assume to know better, and the ideas of the Rosicrucians about the elementary spirits, the goblins and the elves, have sunk into the "limbo of magic” and fairy tales for early childhood.
Paracelsus
A law explains a set of observations; a theory explains a set of laws. The quintessential illustration of this jump in level is the way in which Newton's theory of mechanics explained Kepler's law of planetary motion. Basically, a law applies to observed phenomena in one domain (e.g., planetary bodies and their movements), while a theory is intended to unify phenomena in many domains. Thus, Newton's theory of mechanics explained not only Kepler's laws, but also Galileo's findings about the motion of balls rolling down an inclined plane, as well as the pattern of oceanic tides. Unlike laws, theories often postulate unobservable objects as part of their explanatory mechanism. So, for instance, Freud's theory of mind relies upon the unobservable ego, superego, and id, and in modern physics we have theories of elementary particles that postulate various types of quarks, all of which have yet to be observed.
Johannes Kepler