Our modern American view of walking at night includes plenty of street lights, but if you are in a wilderness area the experience is different. With only the stars to guide us, seeing a tree before walking into it is just possible, unless it is a small tree. With a full moon, it is possible to tell the difference between a large rock and a shrub, most of the time.
We are creatures of the light. We do not function well in the dark. That is not just a physical condition. Our eyes need light, and our souls do as well. As Isaiah said, The people who walked in darkness have seen a great light. They lived in a land of shadows, but now light is shining on them. GNT
Jesus brought the Light to us. Matthew used a heavy hand to link Jesus with the Isaiah passage to make sure we did not misunderstand the importance of it. As John described it: In him appeared life and this life was the light of mankind. The light still shines in the darkness and the darkness has never put it out. Phillips
Paul had to remind the church at Corinth that the Light of the world is Jesus. John announced the coming of the Light, but he was not the Light. Peter walked with the Light, but was not the Light. Paul preached the Truth of the Light, but Paul is not the light.
If I walk with Jesus, I walk in the Light. No matter how dark this world may seem, the Light is here for those who believe.
Be righteous and do good.