During my 67 years' worth of life lessons, I've been told more than once that three is not a good number for relationships. Don't date in threes, don't live in threes, and don't jointly own anything in threes. One person always gets left out; another tries to take over. Then there is the person in the middle. Threes are a disaster when it comes to relationships.
Odd, then, to learn a few years ago that the quark, the smallest subatomic particle, the fundamental building block of everything, only comes in threes. In other words, it only comes in relationship. From this quantum discovery, it is not a difficult leap to believing that our God, the creative force behind everything, also and only exists as a threesome. Whether one is Creator or created, being in relationship is primary, and threesomes are apparently where it's at.
It may help to remember that the Trinity, a dogma hotly debated over the centuries, is not first and foremost a doctrine. Rather, it is how the Divine has been experienced through the ages, as a unity of Source, Spirit and Savior -- like the quark, always and eternally in relationship.
Thus, today's readings are not about the doctrine of the Trinity, but about the experience behind it. In Deuteronomy, we hear an almost childlike awe at the wondrous things Yahweh had done among the Israelites. Has anything so great as this ever happened? Has anything like it ever been heard of? Awesome deeds. Awesome.