Vivaldi wrote over 500 instrumental concertos and sacred choral works. He also composed 40 operas, not for the school where he taught violin (Ospedale della Pietà), but for public performance in Venice. That is exceptional, given his poor health. The single complaint he made about that was in a letter, saying that he had a tightening of the throat. He and Chopin, who suffered from poor health, too, were geniuses, and if anyone hears me complain ever again, smack me.
Vivaldi and Chopin had different dispositions: Chopin kept his Catholicism private. See Piano under the More Tab for more about what he said to his closest friends, and the girlfriend he never married.