Trinity Sunday is one of the few celebrations of the Christian Year that commemorates a reality and a doctrine rather than a person or event. On Trinity Sunday, Christians remember and honor the eternal God: the Father, the Son, and the Holy Spirit.
The Trinity is one of the most fascinating - and controversial - Christian teachings. The Trinity is described as a "mystery." By mystery the Church does not mean a riddle, but rather the Trinity is a reality above our human comprehension that we may begin to grasp, but ultimately that we simply believe. It has been said that mystery is not a wall to run up against, but an ocean in which to swim.
Common wisdom is that if you discuss the Trinity for longer than a few minutes, you will slip into heresy, because you are probing the depths of God too deeply. And so we simply and clearly confess the Trinity and rejoice in the reality that this is who our God is - One God in three persons and three persons in one God.
As we wrap our "One" series in the morning (6/11/17), it's fitting that we finish at the close of Paul's second letter to the Corinthians (2 Corinthians 13:11-14). Here Paul has some closing exhortations for us as we seek to build and strengthen the unity that the church already has through faith in Jesus. We also find great hope and comfort in the promised blessing that comes from our Triune God.