Extract from Pilgrimís Progress

{162}  . . . one of the wicked ones got behind him, and stepped up softly to him, and whisperingly suggested many grievous blasphemies to him, which he verily thought had proceeded from his own mind. This put Christian more to it than anything that he met with before, even to think that he should now blaspheme him that he loved so much before; yet, if he could have helped it, he would not have done it; but he had not the discretion either to stop his ears, or to know from whence these blasphemies came.

{163} When Christian had travelled in this disconsolate condition some considerable time, he thought he heard the voice of a man, as going before him, saying, "Though I walk through the valley of the shadow of death, I will fear no evil, for thou art with me." [Ps. 23:4]

{164} Then he was glad, and that for these reasons:

First, Because he gathered from thence, that some who feared God were in this valley as well as himself.

Secondly, For that he perceived God was with them, though in that dark and dismal state; and why not, thought he, with me? though, by reason of the impediment that attends this place, I cannot perceive it. [Job 9:11]

Thirdly, For that he hoped, could he overtake them, to have company by and by. So he went on, and called to him that was before; but he knew not what to answer; for that he also thought to be alone. And by and by the day broke; then said Christian, He hath turned "the shadow of death into the morning". [Amos 5:8]

( Taken from Chapter 10, sections 162-164. Source: http://www.gutenberg.org/files/131/131-h/131-h.htm )

The above is the only relevant part of the book. It is brief because, as I stated, although Bunyan speaks of it confusing Christian, he does not make a big deal of it. Neither should we make a big deal of it when it happens to us.