I think there is a difference in knowing things and knowing nature of mind. We use to learn in our human life. Like students who are repeating and repeating their long course in order to lock it sharply up in the storehouse to can accomplish their examination.
Then there is understanding of the Buddha's teachings, which as far as i understand conteins /is knowing ' the nature of mind', this knowing turns in freshness, always fresh right now in clarity, joy, compassion since there is peace.

Oh yes, there are debates, prayers, sutras, tantras to lighten darkness, if all goes smoothly.
The example of the Vietnamese teacher about the hard knowledge, is like throwing ice cubes to each others' solid head, i mean not this happen here.
Knowing nature is soft flowing, is compassionate. Like nectar Tsoknyi Rinpoche should say.



