sentences:  Umāsvāti also defined a series of fourteen stages of spiritual development (guṇasthāna), into which he embedded the four fold description of dhyana.These stages culminate in the pure activities of body, speech, and mind ("sayogi-kevala"), and the "cessation of all activity" ("ayogi-kevala").Umāsvāti also defined meditation in a new way (as "‘ekāgra-cintā’")