This is basically the true art of the mind. It allows you to know the truth about the universe, feel the universe, and be in synch with the universe.
How to StartEdit
This may sound kind of dorky and boring but you need to meditate and reprogram your mind to understand that there is no truth and not to have any doubt. Know that you're taking a big risk when you do anything. Know that you could even be trying something thats really fake.
There are many types of abilities attained when you do this kind of thing. Heres a list!