Since it is the practice of enlightenment, that practice has no beginning and since it is enlightenment within the practice, that realization has no end.
DogenZazen is an activity that is an extension of the universe. Zazen is not the life of an individual, it's the universe that's breathing.
DogenIn the assemblies of the enlightened ones there have been many cases of mastering the Way bringing forth the heart of plants and trees; this is what awakening the mind for enlightenment is like. The fifth patriarch of Zen was once a pine-planting wayfarer; Rinzai worked on planting cedars and pines on Mount Obaku. . . . Working with plants, trees, fences and walls, if they practice sincerely they will attain enlightenment.
Dogen