Reference: Essays on Substance
The Principle of Gravity
A material body has mass. The free motion of a body manifests as a constant velocity. When this constant velocity is disturbed, inertia is manifested. Inertia is resistance. Inertia is manifested because the body has mass. The mass exists whether inertia is manifested or not. The whole purpose of inertia is to restore the free velocity of the body.
The above logic applies to light also. Light has a constant speed. If the constant speed of light is disturbed then inertia will be manifested. Inertia is manifested because light has consistency. Inertia of light restores the free velocity of light.
This principle may be applied not just to a single object, but to a whole system of bodies or substance.
This is the principle of gravity.
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