And God said, “Let there be light,” and there was light. And God saw that the light was good. And God separated the light from the darkness. God called the light Day, and the darkness He called Night. And there was evening and there was morning, the first day. Genesis 1:3-5
Light is not a physical substance. Classically it is considered to be a varying electric and magnetic field that spreads across from one place to another. Quantum physics says that light can also be considered to be particles called photons that carry energy and momentum but have no mass. In both descriptions, the light energy is carried by a very real and quantifiable mechanism.
For the past two days little clusters of students have gathered around test tube racks on blue picnic tables to count bubbles evolved from Elodea pondweed. A very real and quantifiable mechanism produced by light, a nonphysical substance.
And I helped a few students with the lab report verbiage. How to capture with words how light is the source of all life? All life’s energy is derived. Except light. It neither pushes nor pulls; it simply moves.
And I AM the Light of the World. Whoever follows me will never walk in darkness, but will have the light of life.
And He is at work. Sometimes unobserved. But never impotent. It is not in His nature.