Yeah, he lived by his "faith" alrighty - his faith in socialism/communism, his faith in collective action in lieu of individual responsibility, his faith in "turning the other cheek" to the likes of Stalin, Hitler, Mao, Ho Chi Minh - anything to avoid actually taking up arms in defense of one's home, family, country, or way of life.
Yup, Berrigan was one admirable guy, OK.
</sarcasm>
Berrigan began as a prophet and ended as an activist for a political cause. Quite a comedown. In the end he seems to have been more socialist than Catholic, a man of the world despite his humble trappings.