Notes on The Holy Gospel of Jesus Christ, According to St. Matthew (Author Bishop Richard Challoner (ed.))
17:20 As a grain of mustard seed: That is, a perfect faith; which in its properties, and its fruits, resembles the grain of mustard seed, in the parable, chap. 13. 31.
Original Douay-Rheims from Project Gutenberg - Massive cleanup of OCR problems and editing done locally.