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This research is done on the series of books written by John Norman, the comments in italics are mine and my point of view.
Woman of Gor
I shall never forget the words he spoke, which so
terrorized me.
"Lo Rask,"said he, ";Rarius, CivitavisTrevis."
"I am Rask," he said, "of the caste of warriors, of the
city of Treve."; page 266

"I am of the warriors," he told me, "which is a high
caste, I have been educated in the second knowledge,
so I know of your world. Your accent marked you a
barbarian."  Assassin of Gor, page 334

In particular I find it difficult to write. In defense I might
point out that I can print Gorean fairly well, and can
sign my name with a deftness which actually suggests
to those who do not know better that I am fully literate
in the language. In further defense I might point out
that many warriors, for no reason that is clear to me,
seem to take pride in a putative lack of literacy. Indeed,
several fellows I have known, of the scarlet caste, take
pains to conceal their literacy, seemingly ashamed of
an expertise in such matters, regarding such as
befitting scribes rather than warriors. Thus, somewhat
to my embarrassment, I found I fitted in well with such
fellows. I have known, incidentally, on the other hand,
Warriors of Gor
Education of the Warrior
several warriors who were quite unapologetic about literacy interests and capacities, men who were, for example, gifted historians,
essayists and poets. Magicians of Gor, page 76

"He is from the place called .Earth', too," said Marcus. Marcus, of high caste, was familiar with various tenets of the second
knowledge, such things as the roundness of his world, its movement in space, and the existence of other planets. On the other hand
he remained sceptical of many of these tenets as he found them offensive to common sense. He was particularly suspicious of the
claim that the human species had an extraterrestrial origin, namely, that it did not originate on his own world, Gor. It was not that he
denied there was a place called 'Earth' but he thought it must be somewhere on Gor, perhaps east of the Voltai Range or south of
the Tahari. Marcus and I had agreed not to discuss the issue. I had no ready response, incidentally, to his suggestion that the human
race might have originated on Gor and then some of these folks, perhaps transported by Priest-Kings, had been settled on Earth.
Indeed, although I regarded this as quite unlikely, it seemed an empirical possibility. For example, anthropoidal fossils can be found
on Gor, as well as on Earth, and so on. At any rate, Marcus found it much easier to believe that magic existed than that his world was
round, that it moved, and that there might be other worlds rather like it here and there in the universe. In fact, in his philosophy, so
to speak, the universe was still of somewhat manageable proportions. Sometimes I rather envied him. Magicians of Gor, page 295,