High in a fold of Jughandle Peak in the mountains north of our home in Idaho lies a glacial lake. The route to the lake goes up a steep, exposed ridge through boulders and loose scree. It’s a strenuous ascent.

At the beginning of the climb, however, there is a brook—a spring that seeps out of soft, mossy earth and flows through a lush meadow. It’s a quiet place to drink deeply and prepare for the hard climb ahead.

In John Bunyan’s classic allegory of the Christian life, The Pilgrim’s Progress, Christian arrives at the foot of a steep ascent called the Hill…