I have not now said mass for twenty-five years, and I shall never do so again, not because of a veto or a command, as His Eminence can confirm, but of my own accord, and this on account of an ailment I have suffered from since birth, which oppresses me greatly.
Letter of November 16, 1737. As quoted in: Antonio Vivaldi: His Life and Work (University of California Press, 1970), p. 11