What Is the Trinity All About?

Quoting Pastor Todd Wilken from his article in the Winter 2010 Issues, Etc. Journal titled “The Theology of Jesus”:

    Philosophically, it is dangerous to assign God a raisons d'être, a reason for being. However, if we can suspend our philosophical misgivings and ask, “What is God’s reason for being?” the answer is found there at the Cross, in the dying breath of Jesus.
    The death of Jesus for sinners is what the Trinity is all about. The Cross is not the Trinity’s avocation, hobby or emergency plan. There isn’t a box hanging on the wall in heaven with a Cross in it, and a sign reading, “In case of sin, break glass.” The Cross is the Triune God’s overarching purpose from before the foundation of the world. If we could be so bold to say such a thing about God, the Cross is why God is, and why He does what He does.