How would you know who is your true disciple?
I don't care. Why should I know if someone is true or untrue? If they are truthful, they will move up. If they are untruthful, they will fall down because nobody's intellect is in their control.
Why should anyone doubt anybody, whether they are true or false? In my eyes, everybody is good, and if they do something wrong, they are definitely going to go down, but they will come back up again. It's very simple mathematics.
I don't need anything from any disciple. If they move up, very good, if they don't, let them face the music. See, even facing the music makes them good and stronger. You know, I never go to console anyone, "Oh, I am so sorry, you poor thing". You have a problem? Okay, good, deal with it!
This is intimate knowledge, not to be spoken out to the masses. This is to make one understand how to move in the knowledge, and how to move in the path. So there are very many ways.