People have strengthened their truth, they have taught and fought and arrived at nothing. Very often those who do not understand a subject argue for the reason that they want to know about it, but they do not honestly want to know about it. Their way is to argue; then they know the other's idea also. They oppose the other to hear what he has to say; it is a kind of robbery. They have a thirst for argument. He who will not understand will never understand, however much it is true. He who understands-you tell him and he will understand. It is a matter of evolution.