In Nathaniel Hawthorne's story, "Young Goodman Brown," Brown discovers, to his horror, that the woman who taught him his catechism (Goody Cloyse) is in league with the Devil, and he is horrified and disheartened.
At this point, Brown sits down on a tree's stump along the forest's path and refuses to proceed with the Devil any farther on their journey.
The argument Brown presents to the Devil is that even if Goody Cloyse had been responsible for teaching him about his faith while he has all along believed her to be a good woman of God, what would possess him now to abandon his wife, Faith, to follow the old woman instead?
If Brown's speech here is figurative, he may be arguing with the Devil or himself, but "Faith" may not refer to his spouse, but to his belief in God, and his determination is not to stray from the "straight and narrow" path that leads to heaven. His argument would sound a great deal like a parent's admonishment, "If Johnny decides to jump off of a bridge, does that mean you will do it too?" He is saying, "no."
Brown may mean that just because a woman he believed had a strong faith fails, and chooses to "traffic" with the Devil, it does not mean that he will turn his back on what he believes simply because the old woman's faith was not strong enough.
The irony is that at the end, Brown does almost the same thing. He may not intentionally join the Devil, but he does turn his back on Faith and his religion, and in this manner, the Devil may be thought to have "won" anyway.