The human body is frail, the power is stronger than your body can withstand. If you tap into that power it destroys you like the sith become consumed and destroyed. I learned this the hard way, all my injuries came from testing myself, because I didn't have faith in the process. Had I had faith in the process these injuries would not have occurred, it is because I indulge in too much power that I inevitably break myself. Power is corrosive, it must be applied gently.