The phrase "perii quoad hoc mundum" appears within quotation marks in a letter from Anne Killigrew Neville to Mr. Windebank, secretary to Elizabeth I's Secretary of State Sir Robert Cecil, written on 6 March 1601 to plea for the Crown's leniency in confiscating the property of her husband Sir Henry Neville (1564-1615) after his imprisonment in the Tower for complicity with the Essex rebellion. The quote suggests a religious context, and other parts of the letter imply that Anne was a pious as well as a learned woman. However, I have been unable to identify where this phrase originates - despite the help of Perseus and a searchable text of the Clementine Vulgate. If anyone can direct me to the source of this quote, I would be most grateful.