The whole verse reads "Yea, though I walk through the valley of hte shadow of death..." (Ps 23: 4a KJV). When we are walking some trips seem to take forever and we wonder if they will never end. But they do. And so too will the journey through the valley. But as we walk through, we need to ask ourselves, "What is the lesson or message God wants me to learn or at the very least hear or experience?"
A person can never rush a journey when they are walking, they will only tire themselves out and have to remain in that place longer than they need to or want to. A slow steady pace is what is required for someone to move through the valley. Keep focused the destination and you will get through, with the Lord's help.
Blessings, Becky