Dogen Zenji

Dogen (1200 - 1253) was the founder of the Soto Lineage of Buddhism in Japan. He came from a noble family, but his life was unhappy and difficult, because his parents died when he was a very young boy. Their deaths lead him to contemplate the impermanence of life, and at the age of thirteen, he became a Buddhist monk.
Dogen didn't realize the truth of Zen for a long time. The difficulty of Zen meditation is not the training, but the letting go of preconceived ideas. The experience of the true self is a state of awareness that cannot be defined; words cannot express living reality. In the experience of the true self, there is no "I" no reference point whatsoever.
 Dogen taught a way of sitting called Shikantaza, "shikan" means nothing but, "ta" means to hit, "za" means to sit. Shikantaza has remained the basis of Dogen Zen up to the present; it unites the means can end of sitting meditation. There is no means to an end, because the end is now. The act of sitting itself is the actualization of Buddha Nature or Being. The meditation does not strive for Satori, but has faith on the teacher and teachings, and trusts that realization will come as a result of sitting practice..
Dogen taught that sitting in Zazen was entering the flow of each moment by dropping from the mind the concepts of past, present, and future. Life is one and its flow of movements and events should not be held to or dominated to create illusions of permanence. All moments and all actions, whether they are important, insignificant, fascinating, or boring. -- are seen as the actual realization of Buddhahood. The Shikantaza helps one realize this moment now. In the Shobogenzo, Dogen said that it was useless to fix one's hopes on a goal.