Theravada novices meditating under crots, umbrella mosquito net tents (dharmathai.com)
|Kammatthana Yantra, Thai Forest|
"Mind precedes all mental states. Mind is their chief. They are all mind-made. If with a skillful mind a person speaks or acts, happiness follows like one's never-departing [and easily hauled] shadow" (Dhammapada 1-2).
Ajahn Mun explains
|Life-like statue of Ajahn Mun|
So when Ajahn Mun's disciples contemplate in accordance with the Doctrine and Discipline until namo is perfectly clear, then mano lies at the end point of formulation. In other words, it lies beyond all formulations.
All supposings come from the heart. All of us have our own load, which we carry as "supposings and formulations" in line with the currents of the flood (of corruptions, biases, ogha).