Let go over a cliff, die completely, and then come back to life--after that you cannot be deceived.
There is no need to be afraid of beguiling characters and those who would cause you harm by leading you back into the darkness once you've seen-and experienced-the light. But first, you must take the time and energy to go there. The light, that is.
The light is a scary place. Truth can be frightening. That's why few find it and fewer use it once they have. But, friends, if you can unravel yourselves to what is known and what is real then you will find that you have become a very powerful being indeed. So powerful that you will tear through lies and misconceptions without blinking. Because you are not afraid of the Truths that they hide.