The nature of Venerable Acharn Mun’s citta was unusually dynamic, venturesome, quick and sensitive to whatever events he came into contact with. To begin with, in doing the practice of bhavana, he used the preparatory repetition (parikamma) “Buddho....” As soon as his citta dropped into a concentrated, calm state, he saw a “nimitta”, sometimes of himself, dead in front of him, sometimes of a corpse in front of him
— as has already been described in his Biography. Then he took that nimitta which had appeared before him as an indicator of the way his meditation practice should go from then on