Found in An Unwilling Guest
Written by Ralph Connor, Copyrighted 1898
From the introduction:
Few lives are lived altogether upon sunlit I uplands ; most have to dip down into valleys ; but to some there comes a sudden cleaving, and there yawns for ever after the ragged lips of a disfiguring canyon. That is no lovely thing, but black and bitter ; and many a life has come to its ending there in those black depths. But to many others the canyon is an episode, and the life goes on richer, fuller, sweeter than before. How this may be is \ the secret the story of Gwen's Canyon holds.
But were it not that before that black day she had come to know the Pilot and his Gospel story, then no one would dare to tell and none could bear to hear the story of Gwen's Canyon. It is only for canyon people.