What you can't teach someone is how to find the door. You can't give someone a door to another universe. You can tell them that the door exists, and if they're stuck in the hallway you can be like, "You're stuck in the hallway," but you can't open the door for them.
Man, as the minister and interpreter of nature, is limited in act and understanding by his observation of the order of nature; neither his understanding nor his power extends further.