when a guy ask Monk Bu Dai (representing Maitreya Bodhisattva) what Buddhadharma is all about, He put down his Cloth Sack representing to let go. The guy then ask what next after letting go. Monk Bu Dai pick up the sack again and walk off. this mean to help All sentient beings. which is all Buddhas and bodhisattvas are doing without end.
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