What is it to have self-discipline? It is to be able to say, "I can" and not "I cannot." No doubt the words "I cannot" are often used when a person does not think it would be wise or just to do a certain thing. In that case it is different. But when there is something he believes to be just, to be good, to be right and he still thinks, "I cannot", it is then that self-discipline is lacking. When a person says, "I cannot tolerate, I cannot endure, I cannot bear, I cannot forgive", these are all signs of lack of self-discipline.