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.
Therefore, to the same natural effects we must, as far as possible, assign the same causes. As to respiration in man and beast; the descent of stones in Europe and in America; the light of our culinary fire and of the sun;the reflection of light in the Earth; and in the planets.
Yet, had we the proof of one experiment that any undivided particle, in breaking a hard and solid body, suffered a division, we might by virtue of this rule conclude that the undivided as well as the divided particles may be divided and actually separated to infinity.

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