 Sophisticated mysterians about the Trinity appeal to “mysteries” in the fourth and fifth senses. The common core of meaning between them is that a “mystery” is a doctrine which is (to some degree) not understood, in the sense explained above. We here call those who call the Trinity a mystery in the fourth sense “negative mysterians” and those who call it a mystery in the fifth sense “positive mysterians”. It is most common for theologians to combine the two views, though usually one or the other is emphasized.