Jesus is sometimes referred to as the Bread of Life as well as the Word. When I read Matthew 4:4 with that in mind this is what I hear: Just knowing about Jesus (living on bread alone) is not enough. I must live Jesus (every word that comes from the mouth of God). Just like the bread on my cooling rack looks wonderfully delicious, it's not until I cut into the loaf and eat it will I receive the nutrition it offers. It can, just as Jesus can, easily fill me up to the point that I shall not hunger any longer.