section_path: Life and career/1813–1822: Acclaim/Resurgence
section_name: Resurgence
paragraph_text: Resurgence
  
  Despite the time occupied by his ongoing legal struggles over Karl, which involved continuing extensive correspondence and lobbying, two events sparked off Beethoven's major composition projects in 1819. The first was the announcement of Archduke Rudolf's promotion to Cardinal - Archbishop as Archbishop of Olomouc (now in the Czech Republic), which triggered the Missa solemnis Op. 123, intended to be ready for his installation in Olomouc in March 1820. The other was the invitation by the publisher Antonio Diabelli to 50 Viennese composers, including Beethoven, Franz Schubert, Czerny and the 8-year-old Franz Liszt, to compose a variation each on a theme which he provided. Beethoven was spurred to outdo the competition and by mid-1819 had already completed 20 variations of what were to become the 33 Diabelli Variations op. 120. Neither of these works was completed for a few years. A significant tribute of 1819, however, was Archduke Rudolf's set of 40 piano variations on a theme written for him by Beethoven (WoO 200) and dedicated to the master. Beethoven's portrait by Ferdinand Schimon of this year, which was one of the most familiar images of him for the next century, was described by Schindler as, despite its artistic weaknesses, "in the rendering of that particular look, the majestic forehead... the firmly shut mouth and the chin shaped like a shell,... truer to nature than any other picture". Joseph Karl Stieler also created his own portrait of Beethoven.
  
  Beethoven's determination over the following years to write the Mass for Rudolf was not motivated by any devout Catholicism. Although he had been born a Catholic, the form of religion as practised at the court in Bonn where he grew up was, in the words of Solomon, "a compromise ideology that permitted a relatively peaceful coexistence between the Church and rationalism ". Beethoven's Tagebuch (a diary he kept on an occasional basis between 1812 and 1818) shows his interest in a variety of religious philosophies, including those of India, Egypt and the Orient and the writings of the Rig-Veda. In a letter to Rudolf of July 1821, Beethoven shows his belief in a personal God: "God... sees into my innermost heart and knows that as a man I perform most conscientiously and on all occasions the duties which Humanity, God, and Nature enjoin upon me." On one of the sketches for the Missa solemnis he wrote "Plea for inner and outer peace".
  
  Beethoven's status was confirmed by the series of Concerts sprituels given in Vienna by the choirmaster Franz Xaver Gebauer in the 1819/1820 and 1820/1821 seasons, during which all eight of his symphonies to date, plus the oratorio Christus and the Mass in C, were performed. Beethoven was typically underwhelmed: when in an April 1820 conversation book a friend mentioned Gebauer, Beethoven wrote in reply "Geh! Bauer" (Begone, peasant!)
  
  In 1819, Beethoven was first approached by the publisher Moritz Schlesinger, who won the suspicious composer round, while visiting him at Mödling, by procuring for him a plate of roast veal. One consequence of this was that Schlesinger secured Beethoven's three last piano sonatas and his final quartets; part of the attraction to Beethoven was that Schlesinger had publishing facilities in Germany and France, and connections in England, which could overcome problems of copyright piracy. The first of the three sonatas, for which Beethoven contracted with Schlesinger in 1820 at 30 ducats per sonata (further delaying completion of the Mass), was sent to the publisher at the end of that year (the Sonata in E major, Op. 109, dedicated to Maximiliane, Antonie Brentano's daughter).
  
  In early 1821, Beethoven was once again in poor health with rheumatism and jaundice. Despite this, he continued work on the remaining piano sonatas he had promised to Schlesinger (the Sonata in A flat major Op. 110 was published in December), and on the Mass. In early 1822 Beethoven sought a reconciliation with his brother Johann, whose marriage in 1812 had met with his disapproval, and Johann now became a regular visitor (as witnessed by the conversation books of the period) and began to assist him in his business affairs, including lending him money against ownership of some of his compositions. He also sought some reconciliation with the mother of his nephew, including supporting her income, although this did not meet with the approval of the contrary Karl. Two commissions at the end of 1822 improved Beethoven's financial prospects. In November the Philharmonic Society of London offered a commission for a symphony, which he accepted with delight, as an appropriate home for the Ninth Symphony on which he was working. Also in November Prince Nikolai Galitzin of Saint Petersburg offered to pay Beethoven's asking price for three string quartets. Beethoven set the price at the high level of 50 ducats per quartet in a letter dictated to his nephew Karl, who was then living with him.
  
  During 1822, Anton Schindler, who in 1840 became one of Beethoven's earliest and most influential (but not always reliable) biographers, began to work as the composer's unpaid secretary. He later claimed that he had been a member of Beethoven's circle since 1814, but there is no evidence for this. Cooper suggests that "Beethoven greatly appreciated his assistance, but did not think much of him as a man".