Tozan, a famous Zen master, said:

“The blue mountain is the father of the white cloud.  The white cloud is the son of the blue mountain.  All day long they depend on each other, without being dependent on each other.  The white cloud is always the white cloud.  The blue mountain is always the blue mountain.” 

This is a pure, clear interpretation of life.  There may be many things like the white cloud and the blue mountain: man and woman, teacher and disciple. …They are quite independent, but yet dependent.  This is how we live, and how we practice.

Shunryu Suzuki, Zen Mind, Beginner’s Mind