. >> reporter: in washington, d.c., sister maureen fiedler hosts the public radio program interfaith voices. she tries to broaden interreligious understanding in order to further justice and peace, values she says come straight from her roman catholic faith. >> this isn't something peripheral. this is central to the preaching of the gospel. >> reporter: fiedler entered religious life 50 years ago, just before vatican ii got underway. she says the spirit of the vatican meetings had a profound impact on how she viewed her calling. >> the second vatican council had a marvelous document called "the church in the modern world," which basically underlined the message of justice and peace in the gospel. >> reporter: fiedler became involved in a series of social justice causes, including a 37-day fast in support of the equal rights amendment and rallies in support of the ordination of female priests. >> it just all fit together as a piece for me, and it also fit together in my prayer as i tried to put this together with the second vatican council. it simply made sense to try to alleviate the