The Trinity, Matthew 28, and the Great Commission
The Sunday gospel lectionary reading for Trinity Sunday in this Year A is Matt 28.16–20. As with the readings in Years B and C, it is short and compact. (See below for commentary on this, and here for video discussion of it, and here for video discussion of the epistle from 2 Cor 13, both also linked at the end.)
But many will not preach on this passage! For some reason, this is the one Sunday of the year when those preaching feel they should depart from the Scripture readings, and (sometimes for the only time in the year) try and preach on a theological idea. I can understand the temptation; Stephen Holmes, in his Quest for the Trinity notes the influence of Karl Barth, who commented:
The doctrine of the Trinity is what basically distinguishes the Christian doctrine of God as Christian…in contrast to all other possible doctrines of God (cited in Holmes p 4).
I think this is true, and you only realise how surprising this is if you ask someone who has not thought about it: what is the central distinguishing feature of Christian faith? I remember being asked this when I started ordination training, and still feel my sense of surprise, first, that I hadn’t ever really considered the question and, second, that this was the answer.
But focussing on preaching on the Trinity is a bad idea for several reasons. First, why depart from preaching on Scripture on this day of all days? Secondly, why choose to preach on the Christian doctrine which, although distinctive, has been the biggest and most challenging that theologians have wrestled with down the centuries? Thirdly, why preach on something that so many get so badly wrong, with illustrations of clover leaves or ice, water and steam that alternately lapse into tritheism and modalism or (even worse and more common) make the false analogy between the ‘persons’ of the Trinity and human persons in social Trinitarianism? These problems might be a good reason to do some teaching—but whether this can be done on one Sunday of the year, in a service of worship, is another matter.
