"Fear exists to glorify courage. A timid man exists to glorify a courageous man. There will be no value for goodness if badness does not exist. One side of a thing cannot have significance without the existence of the other side. Hence everything in this world has two sides. Dvandvas exist to keep up the flow of the world."
January 1, 1970
https://en.wikiquote.org/wiki/Swami_Sivananda