Unexplainable Trinity

How does one preach about the unexplainable? This has been the dilemma of every preacher as they ponder the Holy Trinity. There is nothing that exists on earth that can be like it. There are no words man has developed that can describe it. There are no ideas that can understand it. So how does one preach on the unknown and unexplainable?
  Many of us know that St. Patrick, forever famously depicted holding his shamrock, tried using the shamrock to explain the Holy Trinity to his congregation. He explained how the shamrock, while three distinct leaves, was just one shamrock. This explanation sufficed for many years and has sprung many other examples as attempts to explain and understand the belief in a triune God.
  Other examples are: The egg. One egg, three parts. Shell, white and yolk.
                                       Water. Existing as liquid, solid and gas but always
                                                       the same chemical makeup.
All of these, while valid attempts, fall short. Each contains the same deficiency. Our belief is that God is Triune and exists always as three 'persons,' Father, Son and Spirit. Never separated. Always acting together. And in that belief, when the Word became human, though Jesus left the Father and Spirit to become man, at the same time, He remained with the Father and the Spirit. So for these examples to be valid, I should be able to split them apart and yet they will remain one!  Hmmm..... If I remove one leaf of a shamrock, it is no longer one whole.  If I separate the egg, it is pieces of one egg, but it is no longer still one. If I freeze water it is no longer liquid and gas at the same time, unless we accept that water exists independently as each and heat always as all three somewhere in our world at the same time.
   Here is where the faith of a child must kick in. For it is only through the eyes of faith that we can accept the unexplainable. It is only through the eyes of faith that we can accept the unknown. It is only through faith that we can gain understanding. Faith and prayer. Through faith and prayer we learn to accept that we are not yet complete, that we do not yet know everything. And, just as a child matures, we will learn as a people of God as we continue to mature in faith.