Catholic monk, mystic, writer, and justice advocate was very concerned about the rise of atomic weapons. In 1962 he wrote a book called Peace in the Post-Christian Era addressing the immorality of nuclear weapons. He was forbidden from publishing it by his order’s abbot. It wasn’t published until 2004 and has a wonderful foreword by Jim Forest.
Below is an excerpt from Merton to French Catholic philosopher Jacques Maritain on the topic.
[To Jacques Maritain, Feb, 1963] I do not want to bother you with a multitude of things of mine, but I am putting into the mail a mimeographed copy of my “unpublishable” book on “Peace in the Post Christian Era.” Unpublishable because forbidden by our upright and upstanding Abbot General who does not want to leave Christian civilization without the bomb to crown its history of honor. He says that my defense of peace “fausserait le message de la vie contemplative” [would falsify the message of the contemplative life]. The fact that a monk should be concerned about this issue is thought-by “good monks”-to be scandalous. A hateful distraction, withdrawing one’s mind from Baby Jesus in the Crib. Strange to say, no one seems concerned at the fact that the crib is directly under the bomb.–Thomas Merton
From The Courage for Truth: Letters to Writers, edited by Christine M. Bochen (Farrar, Straus & Giroux, 1993, p. 36)