Dr. John Lukacs, Historian

“In 1905 Einstein found that, instead of being a wave, a quantum of energy was a particle―but that such a quantum of energy changes in time, and that thus matter and energy, in certain circumstances, are dependent on the dimension of time.  This is the basis of his relativity theory (one of the implications of which, stated vulgo,[i] is that two by two do not always make four.” ― Historical Consciousness, Copyright © 1968 by John Lukacs, Harper & Row, Publishers, Page 276.