"I am indeed of Opinion, that the Ancients called Man 'Phos', that is 'Light', so that from the Affinity of their Natures, strong desires are bred in Mankind, of continually seeing and being seen to each other: Nay some Philosophers hold the Soul it self to be essentially LIGHT, which among other arguments they would prove, for that nothing is equally insupportable to the Mind of Man, as ignorance and obscurity."
— Plutarch (c. 46-120)
See also Liberty Fund edition, digitized from Plutarch's Morals. Translated from the Greek by Several Hands. Corrected and Revised by William W. Goodwin, with an Introduction by Ralph Waldo Emerson, 5 vols. (Boston: Little, Brown, and Co., 1878). This 1878 American edition is based on the 5th edition of 1718. <Link to OLL>