'Three incalculable eons.' See aso^gi （阿僧祇）. The fifty-two stage practice of the bodhisattva is divided up into three great eons. The 'ten faiths' 十信， 'ten abidings' 十住， 'ten practices' 十行 and 'ten dedications of merit' 住回向 are in the first eon. From the first bhu^mi to the seventh is during the second eon， and from the eighth to the tenth bhu^mi is during the third eon.