The quest for "Empfindsamkeit": Bach's Second Sonata, slow movement ("Tholen")

In 18th century German music the word Empfindsamkeit, which perhaps not quite adequately translates as "sensitivity", is often used. The slow movements of Bach's trio sonatas offer excellent opportunities to find this quality. A contemporary of Bach (was it Forkel?) once said of these sonatas: "man kann von Ihrer Schönheit nicht genug sagen". I could never match that with the cold and rigid way these pieces are so often played.