Jesus did not say that everyone must cut off his right hand, but that “if your right hand causes you to sin” in your walk with Him, then it is better to “cut it off.” There are many things that are perfectly legitimate, but if you are going to concentrate on God you cannot do them. Your right hand is one of the best things you have, but Jesus says that if it hinders you in following His precepts, then “cut it off.” The principle taught here is the strictest discipline or lesson that ever hit humankind.