A technique can only work if it is in harmony with universal principles. Such principles need to be grasped through Mind, pure consciousness. Selfish desires thwart your progress, but Mind, not captivated by notions of victory or defeat, will liberate you. Mind fixes your senses and keeps you centered. Mind is the key to wondrous power and supreme clarity.
Any time we give people the ability to use force, we have to be very careful. It's sort of like the people who spy on us - you've got to watch the watchers.