I dreamed that an old man said to me, "Bodhi is neither a tree nor a mirror, nor a stage. Nothing will cause dust. " What does this mean?

"People think a thing is delicious. In fact, sense of smell is more important than sense of taste, so is it right that a creature with a keen sense of smell like a dog is far happier than us in diet? ... if it's wrong ... what? " The mistake is that dogs are dominated by people, and even if they have a keen sense of smell, they can only eat the food placed in front of them. Being a bodhi tree is like a mirror. Wipe regularly to avoid dust. Bodhi has no trees, and the mirror is not a stage. There was nothing, so there was no dust. These are two different realms of life perception, just like a newborn baby, full of spirituality and without any dust. However, all kinds of society constantly influenced him in the process of his growth, so he needs to constantly cultivate himself and review himself. If he realizes the emptiness of Buddhism, he will practice to a certain level and jump out of the world. There is nothing in the original, so where is the dust?