The Buddha taught that ignorance, created by our greed, hate and delusion, prevents us from realizing that we are all enlightened. The Zen school of Buddhism teaches that the practice of sitting in meditation (Japanese: Zazen) directly manifests our inborn enlightenment, our Buddha Nature.
In Zen practice, seated meditation and enlightenment are one. There is no preliminary training or elaborate preparation necessary to realize the Way.
The Soto School of Japanese Zen practice was founded in the 13th century by the Zen Master Eihei Dogen. In his instructions on how to meditate, Dogen writes:
“The purpose of studying Buddhism is not to study Buddhism, but to study ourselves. To study ourselves is to forget ourselves. When we forget ourselves, we actually are the true activity of the big existence, or reality itself.” - Shunryu Suzuki Roshi