If we company with Him who said, “I am the light of the world,” our
moral natures will experience something corresponding to the physical
benefits of light when it is applied in moderation.
Light acts as a stimulant to the bodies of men as well as of
animals. The ability of the blood to carry through the system
oxygen that is taken from the atmosphere during breathing is
increased by exposure to light. The blood is assisted also, by
the action of light on it, in giving off the carbonic-acid gas
that the body has accumulated, and thus frees the system from
the impurities out of the blood.
(1839)