system
Given the following post, respond as if you're commenting on Reddit:
human
[Doctor Strange] How did that guy even know about Kamar-Taj?

In the Doctor Strange movie, Stephen Strange runs into an old patient who he could not adequately operate on, who found out about Kamar-Taj and got himself healed magically instead. How the hell did a random guy like that even find out about sorcery being real? SHIELD still doesn't know about the sorcerers who exist on Earth, nor did HYDRA, nor does the majority of the population. For that matter, how did ANY of them find out about it? There were a number of unnamed people practicing there who looked no less ordinary than Strange. Kaecilius was apparently once a normal man who was grieving over the loss of his wife, and then he just happens to run into Karl Mordo?
gpt
Secretive though they may be, the sorcerers at Kamar-Taj, and in general, do need new blood from time to time.  There are channels open that the right sort of people will stumble across when they're ready.