If we live our lives in a continuous pursuit of desire, then we are fearful and hurt when we do not get our desires. In the hustle and bustle of life, we can learn from Master Budai. Although he carries a big sack, he is always at ease as he understands when to pick up and when to let go according to the circumstances.
Learning to pick up and let go is just like packing and unpacking a suitcase before and after a trip. Having the wisdom of knowing when to let go is to live in peace without materialistic desire. It is also to have a Dharma body that lives past death.