Read it through once

His tale is connected and told with an appearance of the simplest truth, yet I own to you that the letters of Felix and Safie, which he showed me, and the apparition of the monster seen from our ship, brought to me a greater conviction of the truth of his narrative than his asseverations, however earnest and connected. Such a monster has, then, really existence! I cannot doubt it, yet I am lost in surprise and admiration. Sometimes I endeavoured to gain from Frankenstein the particulars of his creature’s formation, but on this point he was impenetrable.