Food is necessary to sustain life--and for the body to grow. But whatever food one may eat, one day he will die; however, there is a food that enables man to live forever--the bread of life that comes down from heaven and gives life to the world. Likewise, water is needed to quench thirst and to stay alive. But water from wells or pipes cannot quench a man's spiritual thirst. Another kind of water is needed for this--the water of life.
What is truth? The age-old question finds its answer. A person who walks in the dark does not know about the dangers that are around him. He is surrounded by so many dangers that he cannot tell what might come upon him.