The central Adagio is the Sonata's emotional heart in every respect - the cello's initial soliloquy heading forth with deliberation as the melodic line in the instrument's upper register is shadowed by speculative pizzicatos in the depths. Such rumination is summarily curtailed by an eruptive middle section in which dance elements are once more to the fore, but these are leavened by the return of earlier material that enables the movement to retrace its steps on route to a coda that exudes raptness and anguish in equal measure.