Board Thread:Lore Discussion/@comment-10665477-20140105180421/@comment-24374833-20140105182953

I can only speak from my experience with the games, no mage i ever encountered spoke some kind of spell before or while casting some magic.

I doubt that you will find an official reference for it, though.

On the wiki page of Magic it is stated that 'Magic is the transmutation of magicka into a physical force, induced by the user's willpower.', so it's willpower insteaf of verbal methods.

Oh, there's one exception of course, the Thu'um, which really is speech.