“This velocity is so nearly that of light, that it seems we have strong reason to conclude that light itself”

Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter LXXVIII: On the Healing Power of the Mind

Lecture at Kings College (1862) as quoted by F. V. Jones, "The Man Who Paved the Way for Wireless," New Scientist (Nov 1, 1979) p. 348 & Andrey Vyshedskiy, On The Origin Of The Human Mind 2nd edition

The Philosophy of Space and Time (1928, tr. 1957)

1940s, "Autobiographical Notes" (1949)
Context: Reflections of this type made it clear to me as long ago as shortly after 1900, i. e., shortly after Planck's trailblazing work, that neither mechanics nor electrodynamics could (except in limiting cases) claim exact validity. By and by I despaired of the possibility of discovering the true laws by means of constructive efforts based on known facts. The longer and the more despairingly I tried, the more I came to the conviction that only the discovery of a universal formal principle could lead us to assured results.... How, then, could such a universal principle be found? After ten years of reflection such a principle resulted from a paradox upon which I had already hit at the age of sixteen: If I pursue a beam of light with the velocity c (velocity of light in a vacuum), I should observe such a beam as a spatially oscillatory electromagnetic field at rest. However, there seems to be no such thing, whether on the bases of experience or according to Maxwell's equations. From the very beginning it appeared to me intuitively clear that, judged from the stand-point of such an observer, everything would have to happen according to the same laws as for an observer who, relative to the earth, was at rest.

Space, Time and Gravitation (1920)
Context: It is of interest to inquire what happens when the aviator's speed... approximates to the velocity of light. Lengths in the direction of flight become smaller and smaller, until for the speed of light they shrink to zero. The aviator and the objects accompanying him shrink to two dimensions. We are saved the difficulty of imagining how the processes of life can go on in two dimensions, because nothing goes on. Time is arrested altogether. This is the description according to the terrestrial observer. The aviator himself detects nothing unusual; he does not perceive that he has stopped moving. He is merely waiting for the next instant to come before making the next movement; and the mere fact that time is arrested means that he does not perceive that the next instant is a long time coming.<!--p.26

Source: Redemption Ark (2002), Chapter 26 (p. 463)

Verse XXX.9
Tirukkural

About
Context: "This sort of fiction, commonly called "sword and sorcery" by its fans, is not fantasy at its lowest, but it still has a pretty tacky feel; mostly it's the Hardy Boys dressed up in animal skins and rated R ( and with cover art by Jeff Jones, as likely as not). Sword and sorcery novels and stories are tales of power for the powerless. The fellow who is afraid of being rousted by those young punks who hang around his bus stop can go home at night and imagine himself wielding a sword, his potbelly miraculously gone, his slack muscles magically transmuted into those "iron thews" which have been sung and storied in the pulps for the last fifty years.
"The only writer who really got away with this sort of stuff was Robert E. Howard, a peculiar genius who lived and died in rural Texas ( Howard committed suicide as his mother lay comatose and terminally ill, apparently unable to face life without her). Howard overcame the limitations of his puerile material by the force and fury of his writing and by his imagination, which was powerful beyond his hero Conan's wildest dreams of power. In his best work, Howard's writing seems so highly charged with energy that it nearly gives off sparks. Stories such as "The People of the Black Circle" glow with the fierce and eldritch light of his frenzied intensity. At his best, Howard was the Thomas Wolfe of fantasy, and most of his Conan tales seem to almost fall over themselves in their need to get out. Yet his other work was either unremarkable or just abysmal... The word will hurt and anger his legion of fans, but I don't believe any other word fits. Robert Bloch, one of Howard's contemporaries, suggested in his first letter to Weird Tales that even Conan wasn't that much shakes. Bloch's idea was that Conan should be banished to the outer darkness where he could use his sword to cut out paper dolls. Needless to say, this suggestion did not go over well with the marching hordes of Conan fans; they probably would have lynched poor Bob Bloch on the spot, had they caught up with him back there in Milwaukee." ~ Stephen King, Danse Macabre, p. 204,