"...through the valley of the shadow of death...": David is referencing "when" we face difficult times, not "if". It's just part of it. Another key piece is the word "through". We don't camp out in the valley, the Shepherd keeps moving us through it, toward a better destination. And, yet, there are still good things to find in the valley along the way. How have you seen all of this to be true in your own life?