So basically magik is whoever its holder feels it is. You do what a spell recommends as a ground-base of your belief, and alas that belief and the spell itself mold together. I get it!
This is like the feeling of time. If you ever went back in time to set off an explosion maybe that's what created you. Saying you created it, and it created you.
Meaning magic is a foundation for intelligence to learn from, and with that we intellect learn, we believe from past learning's. So with them they exist, and because they exist they happen.
Hardly anyone probably understands this, but I understand. This, this is my theory of magic.
In other words to break it down. Magik became what it is. No one knows how, it just does. Just like we exist. We exist by magik, but magik can't exist without us. Basically it lives because we do. We are all magik surrounded by a layer of bones, blood, and flesh. And because we exist we give magik a reason to exist. And because of its existence we believe in it, and in return it gives what we cast.