Agreed, there are hidden teachers you may come across in life that conceal their understanding from the world at large (i.e. remain silent until the student app

Agreed, there are hidden teachers you may come across in life that conceal their understanding from the world at large (i.e. remain silent until the student appears). On the other hand, there are awakened beings like J. Krishnamurti who prattle on endlessly (eloquently so, mind you) about the no-path to awakening. Also, in the Zen tradition it's pretty common for the master to give Dharma talks, which of course entails lots of talking (Eihei Dogen comes to mind here, saying a lot and revealing little for the rational mind to latch onto). Probably the best example of "Those who know don't say" in recent times was Ramana Maharshi.