Yāska's Nirukta 3.p19

3.p19

dīrghatamasaḥ | yo vāṃ yuṣmadaḥ sampradāne caturthī bhavati dvivacanametat, yuvābhyāṃ mitrāvaruṇābhyām yajñaiḥ saptamyarthe eṣā tṛtīyā, yajñeṣu śaśamānaḥ śasan stuvan dāśati dadāti | kim ? sāmarthyāt havīṃṣi | kavirmedhāvī hotā āhvātā devānāṃ yajati yāgaṃ ca karoti | manmasādhanaḥ mananamanuṣṭheyapadārthaviṣayajñānaṃ tatsādhanabhūtaṃ yasyāsti sa manmasādhano'dhikṛta ityarthaḥ | tasya kim ? ucyate | upetyetad gacchatha ityetena sambadhyate, ahaśabda evārthe