 Let us now examine the difference between the Sŏn tradition and the doctrinal schools in Korean Buddhism, and Chinul’s way of synthesizing them. The Sŏn school is most distinctively oriented to practice. Sŏn here primarily refers to the conjoined practice of samādhi (concentration) and prajñā (wisdom) (Keel 1984). Already in the early work such as Encouragement to Practice and Secrets on Cultivating the Mind, Chinul emphasizes the need to “cultivate concentration and wisdom in tandem”. Concentration means a mental absorption. As the student of Buddhism turns his or her attention away from the world of sensible things and brings it to bear on what is internal, he or she engages in meditation to obtain unmovable peace within himself or herself. In the process, the student exercises pure mental focus with a resulting state of calmness. This is concentration. Furthermore, as this concentration naturally creates the energy of mental penetration, the mind is now directed to make inquiries into the nature of the world and that of the self, thereby generating insight into reality. This is wisdom—it is transcendental understanding of the nature of the world and the self in it, with a resulting state of alertness. The Sŏn then combines the merits of both concentration and wisdom that eventually leads to the discovery of the source of all sentient beings, indeed, the whole world.