Muṇḍaka Upaniṣad 4.2.4-2

4.2.4-2

praṇava oṅkāro dhanuḥ| yatheṣvāsanaṃ lakṣye śarasya praveśakāraṇaṃ tathātmaśarasyākṣare lakṣye praveśakāraṇamoṅkāraḥ| praṇavena hyabhyasyamānena saṃskriyamāṇastadālambano'pratibandhenākṣare'vatiṣṭhate, yathā dhanuṣāsta iṣurlakṣye| ataḥ praṇavo dhanuriva dhanuḥ| śaro hyātmopādhilakṣaṇaḥ para eva jale suryādivadiha praviṣṭo dehe sarvabauddhapratyayasākṣitayā| sa śara iva svātmanyevārpito'kṣare brahmaṇyato brahma tallakṣyamucyate| lakṣya iva manaḥsamādhitsubhiḥ ātmabhāvena lakṣyamāṇatvāt|
tatraivaṃ satyapramattena bāhyaviṣayopalabdhitṛṣṇāpramādavarjitena sarvato viraktena jitendriyeṇaikāgracittena veddhavyaṃ brahma lakṣyam| tatastadvedhanādūrdhvaṃ śaravattanmayo bhavet| yathā śarasya lakṣyaikātmatvaṃ phalaṃ bhavati tathā dehādyātmapratyayatiraskaraṇenākṣaraikātmatvaṃ phalamāpādayedityarthaḥ ||