"When it comes to the standards of classical art, much can be said. It requires very high sensitivity. For us, emotions can easily fall and recover quickly. But that sensitivity can be harmful to oneself because one becomes startled by events here and there. That is why there seem to be exceptional people. Performing a large-scale opera requires singing continuously on stage for three hours. For example, imagine I am the lead character in an opera. Singing nonstop on stage for three hours expends as much energy as working underground for eight hours."