The entire sonata, encompassing three movements, begins “con amabilitá” (with loveliness), and proceeds to develop the initial thematic material through the scherzo second movement and  into the final movement, which begins with a recitative followed by an “arioso dolente” (song of lamentation) and a three-voice fugue, a resumption of the arioso (this time marked “ermattet” – exhausted), then an inversion of the fugue (marked “wieder auflebend” – coming back to life), and finally concluding in a great chorale. The Arioso theme strongly resembles the aria “Es is Vollbracht” (it is finished) from Bach’s “St. John Passion”.

Here is an exquisite performance by Claudio Arrau.

https://youtu.be/B8d4weStyEY