A seemingly innocent sequence, Tyrion may have actually sown the seeds for Jon’s decision to eventually leave the Night’s Watch.
Jon questions Tyrion’s affinity for books, to which he responds: “I must do my part for the honour of my house, wouldn’t you agree? But how?
“Well, my brother has his sword and I have my mind and a mind needs books like a sword needs a whetstone. That’s why I read so much Jon Snow.”
As the series progresses, Tyrion is seen reading less frequently, having proven himself far beyond his physical defect for which he is so frequently berated.
