During my time in college, I spent a semester on a study abroad in Jerusalem and the surrounding Holy Land. In Jerusalem, one of the most popular sayings on tourist tchotchkes is a verse of scripture: If I forget thee, O Jerusalem, let my right hand wither. It’s written on wall hangings, keychains, and T-shirts in almost every shop in the Old City. The words come from Psalm 137, traditionally attributed to the prophet Jeremiah, who relates in narrative verse the lament of the Israelites taken captive into Babylon. The psalm begins, “By the rivers of Babylon, there we sat down, yea, we wept, when we remembered Zion. We hanged our harps upon the…