The woman here is the type of the Church, not yet justified, but just about to be. And it is a part of the resemblance, that she comes from a foreign people. The Samaritans were foreigners, though they were neighbours; and in like manner the Church was to come from the Gentiles, and to be alien from the Jewish race.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Tract. xv. c. 10