St. John has seven distinctive “I AM” statements in his gospel – I am the Bread of Life, I am the Way the Truth and the Life, I am the Resurrection and the Life, I am the Light of the World, I am the Good Shepherd, I am the Vine, and (in today’s reading) I am the Gate.
Each of these sayings symbolically represents (in kaleidoscope fashion) not just what Jesus does but who and what he is. They do not simply stand for or point to their meaning – they ARE their meaning. So, for example, Light of the World does not mean that light gives us some idea of how Jesus functions or how he enlightens. It means that Jesus is HIMSELF light; it is who tells us what light is.; he is what we see by.