John Norris, Mary Astell (1705). “Letters concerning the love of God, between the author of the Proposal to the ladies, and Mr. John Norris: wherein his late discourse, showing that it ought to be intire and exclusive of all other loves, is further cleared and justified”, p.53
Florence Scovel Shinn, Laura Berman Fortgang (2015). “The Complete Game of Life and How to Play It: The Classic Text with Commentary, Study Questions, Action Items, and Much More”, p.15, Hampton Roads Publishing