Grace is drawn directly from the English word, itself rooted in Latin gratia, and is commonly linked with both physical elegance and a sense of favor freely given rather than earned. The name is often read as suggesting ease under pressure -- composure that looks effortless, even when it isn't.
The Moon in ruminating signs joined to retrograde planets, it is not then good to purge; the potion will work upward to the patients injury. - William Lilly (1602.-1681.)