Shwe Oo Min Dhammasukha Tawya 2019 Vassa Q&A 20190709
Yogi: How to investigate when the mind is quiet?
Sayadaw: When the mind is quiet, that is a good time to investigate, or you can use a question to make the mind more awake.
How many objects can the mind know? Or, you can stay with the main object and check the experience and awareness.
Can you recognize the awareness? Do you know what is the object and what is the awareness? Just check.
When the awareness is stronger, the mind can see that the object and the awareness are different. We can stay with the awareness then; we call this awareness of awareness.
When that happens, the 5 sense doors come to the mind-door, and the 6 sense doors become open and the mind knows everything.