VIBRATIONAL • DICTIONARY ONE.COM • Definition of Vibrational

... still earlier time when light had not yet begun. From the "wave-theory" of light, which is one of those working hypotheses which are indispensable, and which, in a sense, may be said to be demonstrated by their indispensability, it can clearly be seen that if light is caused by rapid vibrational movement, there must have been—or at any rate there is nothing against an authoritative declaration that there was—a moment of time when the first vibrational impulse was given, when, in fact, God said "Let there be light, ...

— Creation and Its Records • B.H. Baden-Powell