" According to St. Augustine, the left hand represented the temporal, the mortal, and the bodily, as opposed to the right, which stood for “God, eternity, the years of God which fail not.”25 For centuries the preference for the right hand over the left governed how people fished, ploughed fields, twisted rope, and ate their meals. The Greeks and Romans, for example, always reclined on the left side, propped on the left elbow, leaving the right hand free for the business of eating and drinking. Plutarch noted that parents taught children to eat right-handed from a young age, and “if they do put forth the left hand, at once we correct them.”26 The prejudice against the left hand persisted during the Renaissance, with parents freeing a child’s right hand from its swaddling clothes to ensure right-handedness at the dinner table as well as at the writing desk. "

― Ross King , Leonardo and the Last Supper