Well I disagree with you, and I don't appreciate you belittling my argument like that. One can only know through experience, if you've tested it personally. I know gravity works because I've picked something up and dropped it, thus experienced it. I believe that jumping off a building will hurt because in every instance I've ever seen other people do it, it hurt them, and because I have a working understanding of physics and the limitations of the human anatomy.
Then there's faith, of course. Jumping off a building will hurt because someone told me it will.
Then there's faith, of course. Jumping off a building will hurt because someone told me it will.