"Think, John Carter, of the countless billions of Barsoomians who have taken the voluntary pilgrimage down this cruel river since the beginning of time, only to fall into the ferocious clutches of the terrible creatures that to-day assailed us.
"There is an ancient legend that once a red man returned from the banks of the Lost Sea of Korus, returned from the Valley Dor, back through the mysterious River Iss, and the legend has it that he narrated a fearful blasphemy of horrid brutes that inhabited a valley of wondrous loveliness, brutes that pounced upon each Barsoomian as he terminated his pilgrimage and devoured him upon the banks of the Lost Sea where he had looked to find love and peace and happiness; but the ancients killed the blasphemer, as tradition has ordained that any shall be killed who return from the bosom of the River of Mystery.
"But now we know that it was no blasphemy, that the legend is a true one, and that the man told only of what he saw; but what does it profit us, John Carter, since even should we escape, we also would be treated as blasphemers? We are between the wild thoat of certainty and the mad zitidar of fact--we can escape neither."