Master Bodhidharma came to China from India to spread the Dharma. In the Shaolin Temple, he saw that the monks wanted to realize the Dharma through meditation, so he also followed the monks into the ashram to meditate. Just as everyone was sitting quietly, they suddenly heard the sound of tiles rubbing against the tabletop. When I opened my eyes, it turned out to be Master Bodhidharma holding a porcelain bowl in his hand and rubbing it repeatedly on the edge of the table.
The monks were puzzled and asked what Master Bodhidharma was doing. Master Bodhidharma asked the monks, "What are you doing?" The monk replied, "We are becoming a Buddha in zazen." Master Bodhidharma replied casually: I am grinding a bowl into a mirror. The monks were even more puzzled: how can grinding bowls become mirrors? Master Bodhidharma replied, "Since grinding bowls cannot become mirrors, then how can sitting meditation become Buddhas?"
The monks knew that Master Bodhidharma was a Buddhist master with a very high cultivation, so they humbly asked him for advice: How can I become a Buddha? Master Bodhidharma said that Buddha does not have a certain form, and Zen is not sitting or lying. You only know how to meditate, but you don't know why, and then you will never see the way. Only by cultivating fundamentally can we realize the Great Dao. The heart is the root of everything. Sin is born from the heart, and it is destroyed from the heart. All good and evil are born from the heart. Only by letting go of attachment and not keeping the mind in the same way can we become enlightened and become a Buddha.