Jesus uses a metaphor that was well known in the Hebrew mind. Hunger and thirst. These two words spoke powerfully to the most basic of needs, and often occur together in describing the most dire of circumstances. The prophets speak of those who will no longer hunger or thirst when the King of righteousness and justice returns to liberate his people. This takes on special significance as Jesus, the Bread of Life, is that King … he does what is right (by that he gives to each person freely, and each is satisfied). Throughout the gospels we see Jesus eating with people of all kinds. There was special significance in that he was including all people, they were satisfied and had enough left over … and he called us to participate in the meal in which he symbolized that His body was for all of us. His righteousness (also translated by some justice) is what would satisfy for all would be filled.