When someone comes and makes a big show, a very impressive show, this is the time to make a check to wonder whether you are not taken by external effects.
You know this because you are doing these things when you perform as a magician.
The secret of magic tricks is that you make people look at the wrong things.
So many of these people who are selling spirituality are really doing all kinds of tricks to take your mind off of what is really important.
I would suggest trying to look carefully at these people who are claiming or are serving as teachers.
–Rabbi Adin Steinsaltz