Newton's Rules of Reasoning in Natural Philosophy

RULE I   We are to admit no more causes of natural things, than such as are both true and sufficient to explain their appearances. To this purpose the philosophers say, that Nature does nothing in vain, and more is in vain, when less will serve; for Nature is pleased with simplicity, and affects not the pomp of superfluous causes.   RULE II   Therefore to the same natural effects we must, as far as possible, assign the same causes. As to respiration in a man, and in a beast; the desce...

 Evolution from Inner-Philsophy to Natural Philosophy

There have always been two ways of looking for truth. One is to find concepts which are beyond challenge, because they are held by faith or by authority or the conviction that they are self-evident. This is the mystic submission to truth which the East has chosen, and which dominated the axiomatic thought of the scholars of the Middle Ages. So St. Thomas Aquinas holds that faith is a higher guide to truth than knowledge is: the master of medieval science puts science firmly into second place....