Linji Zong Qingyuan, the Zen Master, once summed up the three realms of his consciousness. When he was not aware, he saw the mountain is a mountain, and the water is water. At the beginning of knowledge, he saw that the mountain was not a mountain, and the water was not water, and after enlightenment, he sees the mountain is just a mountain, and the water is just water.
When you are not aware, you regard appearance as the heart of things. Therefore, you see the mountain as the mountain, see the water as the water. At the beginning of consciousness, you no longer regard appearance as the heart of things. Therefore, you see mountains are not mountains and water is not water. After enlightenment, you realize that the presence and the body of the elements are one, the body and mind are one, selflessness and unselfishness are the Tao. Therefore, you see the mountain is just the mountain, and the water is just water. In the end, you realize that everything is the Tao, and that you and things are not divided, that the material and Tao are one, being and nonbeing are one. Thus, whoever attains Tao, will last forever.