Angry waves: not so dangerous as man's mind.
I have been teaching Zen students on this mountain for almost forty years. Many people come to visit me thinking they are visiting a Zen Master but they only see my form body, the house where my true nature lives. They don’t see my true nature. That is not a problem but it means that they have not seen their true nature.
Because they haven’t seen their true nature, they cannot see their parents, siblings, wife and children, or anybody. They wander through life in vain, like a crazy person. We have to say that this is truly a world of darkness. Students who receive my teaching must do it with sincerity and dedication, not forgetting the methods I used. Ultimately, being sincere and dedicated is paying back your Dharma obligation, so you will not waste your practice or suffer a mental loss.