It is very interesting to observe that there are many people who are deaf and dumb at the same time. This shows that deafness and dumbness are connected, and according to a certain point of view it is the same thing to be deaf and to be dumb. It is just like two ends of one line: when you look at the ends you may say "deaf and dumb"; when you look at the line it is one. In the same way perception and expression are the two ends of one line. In other words, the faculty of speaking and the sense of hearing are the same. If one is lost the other is lost.