I found this interesting quote from John Stott in his book “Between Two Worlds”:

“First, God spoke through the prophets… Next, and supremely, he spoke in his Son… Thirdly, he speaks through his Spirit…”

This seems to be a great way to speak of the mystery of the Trinity from within Scripture itself. It seems really simple, but I think it’s a great way to follow the thrust of the entire Bible and highlight specific roles of each person within the Trinity.