This is a wonderful practice, and we can all learn to do it. A person who is about to die has seeds of suffering in her, but she also has seeds of happiness. You who love this person should recognize the seeds of happiness and suffering in her, and speak to her about the things that evoke happiness in her. It is very important to do this. Even if the person is in a coma, you should speak to her like this. Communication is possible. She will hear you.
