When our mind is tranquil, there will be an occasional pause to its feverish activities, there will be a letting go, and it is only then in the interval between two thoughts that a flash of UNDERSTANDING—understanding, which is not thought—can take place.~ Bruce Lee from, https://www.librarything.com/work/294031
I’m not sure I’ve experienced the not-thought which is that flash of understanding. I think things are even more simple; Year after year, as I quiet my mind, understand simply expands into the new space.
Regardless, tranquility is key. Pausing is key.