User blog comment:-Chloe-/Magic?/@comment-5139779-20120826162343/@comment-5102537-20120826190248

I've always thought that there are those who are born with magic, therefore probably members of the Old Religion, and then there those who just learn to use magic. When Giaus met Merlin the very first time he asked him how he moved the bed and where he studied magic. Merlin answered that he was born that way to which Gaius replied that this was impossible (I guess later it was a continuity flaw that Gaius knew about Emrys and obviously knows a lot about the Old Religion and stuff, so he should have known that it is entirely normal for some sorcerers/witches to be born with magic).

In my opinion, from what I saw on the show, Gaius just learnt magic and studied it while Merlin and Morgana, as well as Kilgharrah and numerous other magical people were born with magic. Spells can be learnt, as I think. Gilli needed the ring to do magic whereas Morgana couldn't control her magic in the beginning and it just happened. I assume that the druids are members of the Old Religion and therefore born with magic, too. And then there are tools to practice magic, like the stone when the two bandits came to Camelot disguised as knights. I'm sure they weren't born with magic but simply used the magical/enchanted object, like many others did and do but are not born with magic. Loki, I'm sure Uther could have learnt it too but I suppose it takes years of studying and practicing. Not to mention that Uther had other things to do back then when conquering or winning Camelot, being the leader of the army and building up the new Camelot - and later forbid magic.

If Gaius was born with magic, he wouldn't have had such a hard time remembering how to use it when the Gobling ran amok. That's how I see it but maybe we'll get an answer to it in season five (which I doubt).