“In the precept lineage [kaike],” Kōen writes, “the profound Ultimate is transferred by means of concrete ritual forms (jisō).” The most distinctive ritual form of the kai kanjō is its elaborations of the mūdra of the palms placed together (gasshō). This mūdra, says Kōen, was performed by Śākyamuni and Many Jewels in the jeweled stūpa and represents the fusion of the object of contemplation and the wisdom that realizes it (kyōchi myōgō), as well as the supramundane truth and the worldly truth being a single suchness (shinzoku ichinyo). Cause and effect, dependent and primary recompense, the single thought-moment and the three thousand realms, yin and yang–all dharmas are encompassed in the gesture of gasshō, which is called the “mūdra of the true aspect” (jissō no in). The Enkai jūroku chō elaborates three kinds of gasshō corresponding to the “three kinds of Lotus Sūtra,” the classification of the Buddha’s teachings employed by Saichō to subsume them within the One Vehicle. (Page 136)
Original Enlightenment and the Transformation of Medieval Japanese Buddhism