Thien, Lisa Ling

"I know that I could never give my heart to anyone else."

No, this isn't a woman talking about her deep love for her significant other, but rather God.

Exclusive Video: Our America With Lisa Ling examines twin bonds and dating

She is just one of the subjects on Tuesday's episode of Our America with Lisa Ling, which focuses on nuns. In the clip below, Ling explores The Sisterhood, a group of women who've taken lifelong vows of "chastity, poverty and obedience" to dedicate their lives to God and the Catholic Church.

Watch:

Our America with Lisa Ling airs Tuesdays at 10/9c on OWN.