Cypress in front of the courtyard, Ming Taizu's purpose is several people-"cypress in front of the courtyard", which is the Zen language of Zen master Zhao Zhou guiding his disciples. This sentence cannot be interpreted literally. Of course, he is not an enlightened person, nor can he understand Zhao Zhou's father's Zen. Enlightenment is really not easy.
The above is the Zen allusion of this couplet, so we can only say the source. Zen cannot be interpreted.