Codex text
Why do Tevinter mages seem less prone to demonic possession than those in the South? First of all, our mages are not immune to possession, and it does happen, as it does everywhere. But yes, abominations seem to show less frequently. This is not a question of talent, as some may believe.
The difference is one of acceptance and education. Here, a mage child is celebrated. Their magic is a gift, and they are taught—with objectivity—how to use it. They are shown possibilities, not just pitfalls. In my time in the South, I've seen how your mages are treated. You cage them—with templars, with walls, but most of all, with shame. They learn to hate and fear everything that they are. When they are told that every spell they cast may open them to possession, every magical action becomes fraught. Is it any surprise then, that magic becomes what they believe it to be—their downfall?
—Excerpted correspondence between Magister Dorian Pavus and Divine Victoria of Val Royeaux