What have been excellent ways for Christian theologians to describe the concept of God, who is also the Trinity?

**Triune Godhead** It goes without saying that Christianity is based on the concept of a Triune Godhead, a Trinity, a Tri-unity. But those theological words do not make it any easier for the lay person, or the seeker, to understand the whole idea of a God that is 3-in-1. So, drawing from Catholicism, Orthodoxy, or Protestantism in the history of Christianity, what illustrations have been used to demonstrate such a mysterious concept? Which of them comes closest to accurately describing this Christian God? Or, per chance, is such a concept beyond comprehension, and falling short of illustrations, so that believers must accept it as a mystery, belonging only to the realm where Eternity exists? **Note**: The OP intent is not to dredge up systematic theology dissertations to prove the concept of the Trinity. This doctrine is stipulated and acknowledged. Rather, since Jesus---and Church Fathers---did not hesitate to use illustrations (and parables) to portray important biblical doctrines, the intent here is to also seek out good illustrations about the Trinity so that ***the plough boy in the realm*** can appreciate and exult in it! **The quest here is not "which one is the best", but which illustrations are available that have been effective and productive while presenting the Gospel to the non-theologians?** Again, do not mistake this as a substitution for presenting the Gospel, but just a way of illustrating the Gospel in terms that people outside the seminary can understand. Remember that *the common people heard Him gladly.* And this wasn't because Jesus was an eloquent pedantic theologian! Neither did He compromise the Gospel of the Kingdom...He was just a good illustrator.