Beyond Viet Nam:  A Time to Break Silence, a speech Dr. King gave at the Riverside Church in New York City on 4 April 1967, a year to the day before he was assassinated is always worth a read and a listen on this or any other day:  text and audio.  His friendship with Thích Nhất Hạnh, a Zen master, global spiritual leader, poet and peace activist who is now back at his “root temple,” Từ Hiếu Temple near Huế in central Viet Nam, is one of the reasons he gave that seminal speech.