LalVis, 5, 7.2 idaṃ caturthaṃ pūrvanimittaṃ prādurabhūt //

LalVis, 11, 1.12 sa sukhasya ca prahāṇādduḥkhasya ca prahāṇāt pūrvameva ca saumanasyadaurmanasyayor astaṃgamād aduḥkhāsukham upekṣāsmṛtipariśuddhaṃ caturthaṃ dhyānamupasaṃpadya viharati sma //