Maitri (Maitrāyaṇīya) Upaniṣad 6.29.p1

6.29.p1

oṃ śucau deśe śuciḥ sattvasthaḥ sadadhīyānaḥ sadvādī saddhyāyī sadyājī syāditi | ataḥ sadbrahmaṇi satyabhilāṣiṇi nirvṛttyo'nastatphalacchinnapāśo nirāśaḥ pareṣvātmavadvigatabhayo niṣkāmo'kṣayyamaparimitaṃ sukhamākramya tiṣṭhati | paramaṃ vai śevadheriva parasyoddharaṇaṃ yanniṣkāmatvam | sa hi sarvakāmamayaḥ puruṣo'dhyavasāyasaṅkalpābhimānaliṅgo baddaḥ | atastadviparīto muktaḥ |
atraika āhurguṇaḥ prakṛtibhedavaśāsadhyavasāyātmabandhamupāgato|
adhyavasāyasya doṣakṣayāddhi mokṣaḥ manasā hyeva paśyati manasā śṛṇoti kāmaḥ saṅkalpo vicikitsā śraddhā'śraddhā dhṛtiradhṛtirhrīrdhīrbhīrityetatsarvaṃ mana eva guṇaughairuhyamānaḥ kaluṣīkṛtaścāsthiraścalo lupyamānaḥ saspṛho vyagraścābhimānitvaṃ prayāta iti ahaṃ so mamedamityevaṃ manyamāno nibadhnātyātmanātmānṃ jāleneva khecaraḥ | ataḥ puruṣo'dhyāvasāyasaṅkalpābimānaliṅgo baddaḥ atastadviparīto muktaḥ tasmānniradhyavasāyo niḥsaṅkalpo nirabhimānastiṣṭhet etanmokṣalakṣaṇam eṣātra brahmapadavī eṣo'tra dvāravivaro'nenāsya tamasaḥ pāraṃ gamiṣyati | atra hi sarve kāmāḥ samāhitā ityatrodāharanti yadā pañcāvatiṣṭhante jñānāni manasā saha |
buddhiśa na viceṣṭate tāmāhuḥ paramāṃ gatim ||

30. _Om!_ One should be in a pure place, himself pure (_śuci_), abiding in pureness (_sattva_), studying the Real (_sat_), speaking of the Real, meditating upon the Real, sacrificing to the Real. Henceforth, in the real Brahma which longs for the Real, he becomes completely other. So he has the reward (_phala_) of having his fetters cut; becomes void of expectation, freed from fear in regard to others [as fully] as in regard to himself, void of desire. He attains to imperishable, immeasurable happiness, and continues [therein].

Verily, freedom from desire (_niṣkāmatva_) is like the choicest extract from the choicest treasure. For, a person who is made up of all desires, who has the marks of determination, conception, and self-conceit, is bound. Hence, in being the opposite of that, he is liberated.