aparigrahasthairye janmakathaṃtāsaṃbodhaḥ [YS 2.39]

asya bhavati ko+aham āsaṃ katham aham āsaṃ kiṃsvid idaṃ kathaṃsvid idaṃ ke vā bhaviṣyāmaḥ kathaṃ vā bhaviṣyāma ity evam asya pūrvāntaparāntamadhyeṣv ātmabhāvajijāsā svarūpeṇopāvartate. etā yamasthairye siddhayaḥ.

niyameṣu vakṣyāmaḥ ---