"I am the Light of the World: he that followeth Me shall not walk in darkness, but shall have the light of life."-- John 8:12.
It was the Feast of Tabernacles when our Lord uttered the words of our text, and it is supposed they were lighting the two great candelabra, which commemorated the fire-cloud that led the desert march. It was in direct allusion to the fiery pillar that our Lord used this metaphor. What that was to Israel, He is to His Church.
The wilderness was a trackless waste to Israel. The people absolutely depended on the cloud to show their path, and to find a resting-place at night. When it gathered itself up from the Tabernacle on which it brooded, the people must strike their tents and follow. However desirable the site of their camp, they must leave it; however difficult the desert paths, they must traverse them; however uninviting the spot where it stopped, they must halt there, and remain as long as it tarried. To linger was to run the risk of wandering aimlessly in the desert till death supervened. Only where the cloud rested did the manna fall, the water flow, or the Divine protection avail.