Ursula K. LeGuin, Earthsea.
From Wikipedia: One vital aspect of magic is that it is impossible to lie in the old language, so that magic works by forcing the universe to conform to the words spoken by the magician.
From Wikipedia: One vital aspect of magic is that it is impossible to lie in the old language, so that magic works by forcing the universe to conform to the words spoken by the magician.
There's also "The Gods are Bastards" (currently on hiatus due to author burnout but there's a huge amount of content to go through for first-time readers), which turns out to be something of a created infosphere, the entirety of the setting's "magic" is really sufficiently advanced technology, which is then used by the "mortals" of the world to emulate technology (through sufficiently advanced magic).
That is, if a mage says something general, all the rest of reality and other mages will just have to deal with it?
It's not like you can simply say something universe-altering just because you know the right words. You still need the magical ability and if you're not powerful enough in that ability for what you want to say, you simply can't say it.
But otherwise, if the mage is THAT powerful, then, yes, the rest of the universe has to deal with it.