You have probably already imagined, with the knack of wizards, that I have reread your latest mail. WHY "REread"?
Swimming through all these words, surfing over the straight text lines, and diving finally into the warm sea of meaning and emotion, I have enjoyed enormously my secret journey. Landing ashore, feeling happy and satisfied, I LAY down in the sun for a while, thinking I would bathe myself again. THE PAST TENSE OF "LIE" IS "LAY".
For discovering new places and new acquaintances, journeys excel. They allow us to step out of our little place on the planet and into the shoes of others. From there we become able to see as if through their eyes.
"I would bathe myself again" should be in italics. Alas, that is not possible on this platform. Try putting clauses next to the words they modify. For example, "in the same way wizards ... do" modifies "imagined".
I don't understand "straight text lines".