When Rebecca’s brother and sister-in-law started having marriage problems, Rebecca prayed earnestly for their reconciliation. But they divorced. Then her sister-in-law took the children out of state and their dad didn’t protest. Rebecca never again saw the nieces she dearly loved. Years later she said, “Because of trying to handle this sadness on my own, I let a root of bitterness start in my heart, and it began to spread to my family and friends.”

The book of Ruth tells about a woman named Naomi who struggled with a heart of grief that grew into bitterness. Her husband died in a…