it doesn't just take a psychedelic experience to see this though.
Just because you haven't experienced something, and overely on your intellectual and thinking faculties (because you can't rationalize or understand something with you mind you discount its rights or existence) doesn't mean its true. Edit: I mean we in general overrely on our minds as filters for knowledge, wisdom and understanding when in reality much of knowledge, wisdom and understanding cannot be grasped by the mind or thinking; in many cases the mind deceives & tricks us.