The ego can exist only if you take yourself and everything seriously. Nothing kills the ego like playfulness, like laughter. When you start taking life as fun, the ego has to die, it cannot exist anymore. Ego is illness; it needs an atmosphere of sadness to exist. Seriousness creates the sadness in you. Sadness is a necessary soil for the ego. Hence your saints are so serious, for the simple reason that they are the most egoistic people on the earth. They may be trying to be humble, but they are very proud of their humbleness. They take their humbleness very seriously.