हरिर् हि निर्गुणः साक्षात् पुरुषः प्रकृतेः परः (Srimad Bhagavatam 10:88:5)
स सर्व-दृग् उपद्रष्टा तं भजन् निर्गुणो भवेत् (Srimad Bhagavatam 10:88:5)
मां भजन्ति गुणाः सर्वे निर्गुणं निरपेक्षकम् (Srimad Bhagavatam 11:13:40)
निर्गुणे ब्रह्मणि मयि धारयन् विशदं मनः(Srimad Bhagavatam 11:15:17)
यान्ति माम् एव निर्गुणाः (Srimad Bhagavatam 11:25:22)
मन्-निष्ठं निर्गुणं स्मृतम् (Srimad Bhagavatam 11:25:24)
मन्-निकेतं तु निर्गुणम् (Srimad Bhagavatam 11:25:25)
निर्गुणो मद्-अपाश्रयः(Srimad Bhagavatam 11:25:26)
मत्-सेवायां तु निर्गुणा (Srimad Bhagavatam 11:25:27)
चशब्दान्मन्नीवेदितं निर्गुणमित्यभिप्रेतम् (Sridhara Swami's Bhavaratha Deepika 11:25:28)
निर्गुणं मद्-अपाश्रयम् (Srimad Bhagavatam 11:25:29)
गुण-सङ्गं विनिर्धूय मां भजन्तु विचक्षणाः (Srimad Bhagavatam 11:25:33)
निःसङ्गो मां भजेद् विद्वान् अप्रमत्तो जितेन्द्रियः (Srimad Bhagavatam 11:25:34)
Excerpts from a discourse by our Sri Sri Muralidhara Swamiji
In 'ekădasa skandam' (11th canto) 25th chapter of Bhăgavatam, Bhagavăn says 'thinking of ME constantly is verily 'nirguna jnăna'; to live in ME is verily 'nirguna văsam'; one who takes refuge in ME and remains egoless is verily 'nirgunam'; the 'shraddha' in worshipping ME is verily 'nirgunam'.'
The food that is offered to Bhagavăn is verily 'nirgunam'.
Everything in nature is grouped under three qualities - 'Sattva (quality of goodness/purity), Rajas (emotions such as anger, passion) and Tamas (lethargy). 'Nirgunam' means that which is free of all these three qualities
Please check these: Excerpts from a discourse by our Sri Sri Muralidhara Swamiji
Those who are Jivan Muktas today began only in this manner. (Every journey starts with a single step.)
The one whose lips are incessantly chanting the Lord's Name is verily the Jivan Mukta (liberated soul).
Thus the identity of the Personal God with Nirguna Brahman is established at the very outset
Namakirtan removed such agonizing stomach pain of a Vedanta Sanyăsin......
If you discriminate in this way, you will understand that the continual remembrance of Hari is the supreme goal to be attained. त्रिगुण असार निर्गुण हे सार । सारासार विचार हरिपाठ ॥
Rama, Govinda, Hari, Murari, Mukunda-whatever name he invokes, it is always the Nirguna or the attributeless Lord that is meant
Tulsidas says, "As by a bridge we can go to both the banks of a river, even so by God's Name we can attain both the Saguna aspect of God and the Nirguna."
Rama Nama gets exactly the same importance in Saguna Upasana as does the Pranava ('Om') Mantra in Nirguna Upasana
Kabir Says, Do not lose the Supreme Name, the Name of the Lord. कबीर निर्गुन नाम न रोसु ॥
More than the comfort of uninterrupted experience of Supreme Self of attribute-less nature, chanting the name of SrI rAma is a better comfort.
By meditating on the form of God, and chanting His Name, we can gradually go beyond all names and forms and ultimately reach the Nirguna aspect.
सत्सङ्गत्वे निस्स्ङ्गत्वं, निस्सङ्गत्वे निर्मोहत्वम् । निर्मोहत्वे निश्चलतत्त्वं, निश्चलतत्त्वे जीवन्मुक्तिः ॥
By chanting the Name of Bhagavăn one attains Atma Jnana, Jivan Mukti state
Chant the Mahamantra Nama kirtan :
Hare Rama Hare Rama Rama Rama Hare Hare
Hare Krishna Hare Krishna Krishna Krishna Hare Hare