Other than His resurrection, the only miracle that Jesus did during His public ministry that is recorded in all four gospels was His feeding of the 5,000.  This amazing event reiterated that as the Bread of Life, Jesus is the only One Who can satisfy our spiritual hunger needs.  In this account, it is interesting to consider that Jesus did not focus on what the disciples "didn't" have, but rather what they did have. . . with the understanding that on their own it was still not enough to meet the challenge at hand apart from God's intervention.  Another concept that this miracle reiterates is that you as an individual do not need to be considered significant by others to be used by God in a mighty way.