There was a reason why Rean took the first Soul Power humans into the sect. That's because one wouldn't understand how to use Soul Power without at least feeling it first. It's just like how Rean mentioned when he first got enough to use it. He would eventually have enough Soul Power on his own as time passed, thanks to his Light Element. But because he didn't know he had it, he might have lived his life without ever using that power.
The first humans found to have Soul Power were then brought into the Soul Hall, where they learned how to use it. Once they finished their training, they would be sent to the several countries taking form in Wringan Continent. All they needed to do was to let some Soul Power run inside those who had a score of above 20 points. Once that was done, those people would be able to feel their own Soul Power in their minds.
