Sister Mary Samuel says the most difficult vow for any nun is that of obedience. Once that is overcome, nothing but good can come. "Everyone has to do the will of God, and when we're doing that, we're the greatest and happiest people. But we have that struggle because we like to do our own will," she says. "We're able to, in religious life, gear that and have that time in silence and prayer to grow closer to him. Our journey is to him and that union, and then we, by being his spouse, we are spiritual mothers as we're mothers to all the children we serve."
Watch the nuns reflect on what you can really hear in silence after the show
Lisa Ling meets a modern geisha