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)
Om Tat Sat
Nirguna Brahman cannot be an object of meditation anywhere in shankarabhashya. Hence it is not an upasya vastu or even dhyeya vastu. An attributeless Brahman cannot be meditated upon. One can say lower capability people can meditate only on Saguna Brahman but higher capability folks can. In that case, it does not become upasana. It becomes a denial of all that is not self. In Bhagavatham these aspects are not explained in the original verses. They vaguely state meditation on nirguna-brahman.
In certain places, Shankaracharya uses the term "sarva samsara dharma varjitam" for Brahman, which does not negate all gunas; however, only those are samsara dharmas. Then one can ask how to understand the advaitic view of satyam, jnanam anantam in negative terms such as asat-vyavritti, achetanat-vyavritti or ajnanat vyavritti, other than that which is limited. This is because, Brahman has no samsara gunas such as limitedness, non-sentience, and non-existence. By the way, one meaning of existence is immutability as per Advaita, not mithya. If you understand it this way, Advaitic writers are stating that Brahman cannot be known as it is not an object but a subject only. Hence all denotations have to denote only upadhis and not Brahma svarupa. If you understand it this way, there is no real difference between Advaita and other Vedantic traditions.Here and there in Shankara bhashya you see terms like (sarva dharma varjitam) or sentences that deny any gunas.If you read how in Shankara-gita-bhashya, over later chapters (say last 6), you see the development of bhakti to saguna brahman, and realization of Brahman as only sakshi, and then finally triputi laya of fusion of jnata-jnana-jneya occur. In fact, without Brahman's grace, the triputi-laya does not happen. see this carefully hidden in the final chapters of Gita. I am not remembering exactly the verses. I can find it later.Best Regards,Krishna Kashyap
Nirguna Brahman cannot be an object of meditation anywhere in
shankarabhashya. Hence it is not an upasya vastu or even dhyeya vastu. An
attributeless Brahman cannot be meditated upon. One can say lower
capability people can meditate only on Saguna Brahman but higher capability
folks can. In that case, it does not become upasana. It becomes a denial of
all that is not self.