While in Vienna, Moscheles was able to meet his idol Beethoven, who was so impressed with the young man's abilities that he entrusted him with the preparation of the piano score of his opera "Fidelio", commissioned by his publisher Artaria. At the end of his manuscript, before presenting it to Beethoven, Moscheles wrote the words "Fine mit gottes Hülfe" ("Finished with God's help"). Beethoven approved Moscheles's version, but appended the words "O Mensch, hilf dir selber" ("O Man, help thyself!"). Moscheles's good relations with Beethoven were to prove important to both at the end of Beethoven's life.