Why are gurus of mysticism sometimes so enigmatic?
The older generations of gurus seem to be more enigmatic than some of the later gurus. Perhaps this was because the older generation had to be more circumspect about the hostile religious situations of their cultures. (Some wax poetic about “bread” and “wine” and “The Friend” but that’s not what they’re talking about).
Apart from that, there is also the inherent difficulty in the absence of a human language that can describe the mystic experience.
Then of course mystics are concerned about giving away too much to charlatanous wannabes.
Mainly though, being enigmatic is a strong way of making the truly called pause, focus on that moment, centre themselves, think, contemplate, meditate their way through the enigmatic challenge.
Being enigmatic sorts out the called from the merely curious.
Used deliberately by a mystic, being enigmatical is a powerful teaching entrancement, a boon to the committed Seeker.
Mystical Experiences of Reality 