He did burn the scroll after this... he's a real hipocrite...
"You know, that's why I rebelled. I have been a rank 1 mage for ten years now and managed to obtain a spell only by stealing it. Don't you think that it's unfair? Don't you think that someone as talented as her, as talented as ME has the right to obtain what he deserves?"
That's the masochist we grew up to like, go ahead and feel pain to become the strongest.
To become stronger as a Myrtharian he needed challenges worthy of him, constantly pushing his limits. He had thought he was just unlucky not to find a worthy predator, but he was wrong. If there was no challenge worthy of him, he could simply handicap himself!