scot-free - In medieval England, a scot was a special tax imposed by the sheriff, usually to meet his salary and payroll. To go "scot-free" meant to avoid paying taxed, a privilege normally available only to the rich and powerful.
miracle - At heart, a "miracle," from the Latin miraculum, is something to gaze upon in wonder, relating to vision words such as "mirror" and "mirage." It translates the New Testament Greek word semion, meaning "sign," as in a portent of divine power.
nitty-gritty - A nit is the egg of a louse, and the grit is a corn kernel that has been boiled, dried, and turned into a meal. A nit in such surroundings would be a tiny thing among tiny things, the origin of this rural African American expression meaning something like "the most essential details" or "the most basic facts of the matter," as in the jazz musicians' phrase, "Let's get down to the nitty-gritty."