You use somewhat poetic language when talking about this secrecy and it might be prone to misinterpretation. I'm quite sure there are secretive groups pursuing expertise in meditation if the meaning of secrecy is such that you could replace "expertise in meditation" with, say, "plaing tabletop role-plaing games" without changing the sentence's truth-value. So they meet privately, do their thing and don't talk about it with people who wouldn't get it (most people, that is) because nobody likes to be called weird.

However, the second paragraph of your post made me imagine secret societies, with robes, masks, irregular meetings in remote locations during the darkest hours of the night and other assorted features. For a moment there, I expected to read a genuinely crazy conspiracy theory. I see that this is not the case but I am still slightly bewildered.