YSBhā zu YS, 1, 17.1, 1.8 caturthas tadvikalo 'smitāmātra iti /

YSBhā zu YS, 2, 18.1, 10.2 ayaṃ tu khalu triṣu guṇeṣu kartṛṣv akartari ca puruṣe tulyātulyajātīye caturthe tatkriyāsākṣiṇy upanīyamānān sarvabhāvān upapannān anupaśyan na darśanam anyacchaṅkate iti //

YSBhā zu YS, 2, 51.1, 4.1 tatpūrvako bhūmijayāt krameṇobhayor gatyabhāvaścaturthaḥ prāṇāyāmaḥ //

YSBhā zu YS, 2, 51.1, 6.1 caturthas tu śvāsapraśvāsayor viṣayāvadhāraṇāt krameṇa bhūmijayād ubhayākṣepapūrvako gatyabhāvaścaturthaḥ prāṇāyāma ity ayaṃ viśeṣaḥ //

YSBhā zu YS, 2, 51.1, 6.1 caturthas tu śvāsapraśvāsayor viṣayāvadhāraṇāt krameṇa bhūmijayād ubhayākṣepapūrvako gatyabhāvaścaturthaḥ prāṇāyāma ity ayaṃ viśeṣaḥ //

YSBhā zu YS, 3, 44.1, 22.1 atha bhūtānāṃ caturthaṃ rūpaṃ khyātikriyāsthitiśīlā guṇāḥ kāryasvabhāvānupātino 'nvayaśabdenoktāḥ //

YSBhā zu YS, 3, 47.1, 6.1 caturthaṃ rūpaṃ vyavasāyātmakāḥ prakāśakriyāsthitiśīlā guṇā yeṣām indriyāṇi sāhaṃkārāṇi pariṇāmaḥ //