Small words have quite a bit to say, such as here in verse 4. Notice David’s assumption of going through the darkest valley, not “if” he would. That’s not an unimportant difference.
David, or more precisely God through him, was teaching us something quite important in this idea. Trusting in Christ does not shield us from danger, pain, and adversity. In fact, the Bible has more to say about how these things will increase, not decrease, because of our faith. We need to understand this. We need to accept this. We need to embrace this. God uses our difficulties for His glory and our good. And David shared one way He does: In these dark times, we can find ourselves more desperate for God and more aware of His presence. Yes, the valleys are dark, but God is with us, carrying His rod and staff. In His presence and in His power we find peace.
What has God taught you and how has He brought good through times of adversity you have experienced?