The hypothesis is that due to the original sin, that is the first great impact, the nervous system grows weaker. This impact on the nervous system is like the first time we felt tingling in our back and had a permanent damage of the nervous system without possibility to repair it. Few people are without that damage and they do not want to be exposed. People with a weakened nervous system cannot do the following: real levitatation, use telepathy, telekinesis, communicate with animals, etc.
More here: http://www.cezna.org/l24.html. Jai Guru Dev, Nenad
