Even as we walk with Jesus, we will experience valleys, struggles, and even discipline. This is something that can catch us off guard in light of the previous verses' mentions of abundance and peace in Christ, yet we know that in this imperfect world, we will inevitably experience hardships. Through all of this, we know that the Lord, our Good Shepherd is with us, and we do not have to fear whatever valley, shadow, or discipline we experience in life here on earth.