I made two mage characters -- first had the sage background, classic apprenticeship and access to libraries. Spent much of her life thinking about how necromancy corrupts the souls of its practitioners. She had Shadowheart destroy that evil tome right away. (and, interestingly, SH approved)
Second character I imagined as an urchin who only learned magic by stealing tomes. She was able to crawl out of the gutter by using the skills contained in the pages of those books. A lust for knowledge and fear that her power could be taken away is one of pillars of her personality. She knew that opening that book was a bad idea. She knows who Szass Tam is, how he treats other wizards and suspects that the tome might be trap. Spend too much time in those pages and Tam might just use the book as a portal to steal her soul . . .
But those anesthetist eyes drew her in. Perhaps this knowledge could be used for good? After all what would be the harm? Just slip on that one ring flip to another page.