And it does!  It works!  The reference is to Augustine of Hippo's Homily on the Gospel of John the Evangelist, Chapter 33, paragraph 5 (numbered).  The reference appears the same in all the texts available on the Vatican website.  Only the Polish text presents the reference within the text; all other language versions contain the reference in a footnote.  The English translation of the Augustine text is available online, and a modest amount of patience and basic Google skills will get you there!  Do it, the Augustine text is a good read!