We as Christians need something that enlightens us in our long walk and that illumination that we need so much is called the Word of God. It is very similar to the people of Israel when they went in the desert, they were guided by the same God through a column of clouds and another of fire. Unlike them, we have the powerful Word of God, which is useful for any work that we are going to undertake.
In Psalm 119:105 it says:
Your word is a lamp for my feet,
a light on my path.