Basically, the monks will send you through a series of trials to see how you handle the situation, and maybe introduce some minor enemies.  That will tell them about your personality, which will let them know how you are out of balance.

There are seven doors in the basement of the monastery, and you will be taken to one of them.  Inside, everyone will face the same trials, and at the end of the passage will meet up in a central chamber where they will receive their crystals.

At least that's how it used to work.  I can have them run everyone in one big group for now if you want to do it that way.  Of course, your character wouldn't know any of this, as the monks and mages won't tell you what the trial entails, as it would skew the results.