This is only an assumption based on what has been said in this thread and others, along with the fact that the condition I will describe is quite common.
It would seem that he thinks he's had some sort of epiphany, or enlightening experience which has opened up some "truth" to him that he thinks he understands and that most other people do not.
So to keep that "truth" seeming all the more mysterious, and to keep his place as the keeper of that "truth" all the more special and important, he'll only speak about his "truth" in riddles and semi-mystical logia.
If in fact he's developed this condition, then consciously he'll believe he does so to appeal only to "the elect" - those people who may also have acquired his "truth" and so will naturally understand what he's saying. But in reality it's actually about the stroking of his ego and boosting the sense of spiritual superiority.