śāntoditau tulyapratyayau cittasyaikāgratāpariṇāmaḥ [YS 3.12]

samāhitacittasya pūrvapratyayaḥ śānta uttaras tatsadṛśa uditaḥ, samādhicittam ubhayor anugataṃ punas tathaivāsamādhibhreṣād iti. sa khalv ayaṃ dharmiṇaś cittasyaikāgratāpariṇāmaḥ.