system
Given the following post, respond as if you're commenting on Reddit:
human
[Dresden Files] In the Dresden files does one have to be born with magic to be a wizard, or can one simply learn to be one?

I know that is theoretically possible to open the sight with things other than magic, but does that really make them a wizard?
gpt
Wizards are born, and then made.

The short answer to your question is - you have to be born with it.  Magic use is a talent for humans, one that not everybody has access too or has in sufficient quantity to make use of.

However, a moderate talent can gain a great deal of power and ability through training and use and an exceptional talent can wither and fade if not exercised.  So a wizard like Mr. Dresden is a combination of those two things.  He is a massive talent, potentially the strongest in raw power in his generation, that has spent literally decades honing and refining.