Namaste,
I am chiming late.
I am no authority on shastras, but would like to share my opinion.
The most important thing is to meditate and realize. Advaitins meditate in 2 ways
1. OM
2. Neti Neti
Neti Neti e.g. can be found in nirvana shatakam / Atma shatakam. It is only for advanced seekers. Most of advaitins meditate on OM.
Om is one such tatva that can take one above maya into it's source i.e. Brahman / Atman. Before interpreting any shastras, one has to deeply meditate and reach it's destination. Scholarlyness is not of any use, even though it may sound logical. It cannot lift you above maya.
OM is one such tatva from which maya originates. So OM, which represents brahman, can take one above maya. It neutralizes any of the thoughts be it positive or negative. Ofcource one has to completely surrender to God. When we move to a source of mantra, mantra itself silences like the fire after burning a corpse will silence. It will not continue says Sri Ramana Maharshi. The core is meditation and not rational or intellectual analysis.
Mandukya Upanishad explains OM. In fact last verses explain all phases of OM including turiya. Bhagavan in Gita (7:8) says that I am OM. So even God has accepted nirguna brahman. Bhagavad Gita is not the only Gita that sung by Shri Krishna. There is Anu Gita, Uttara Gita and Uddhava Gita
Bhagavan in Uttara Gita explains OM chapter 1:5,17,48,49 and 1:6
The chandra bindu which represents turiya state is also accepted by bhagavan, which is explained in last verses. Hence all twelve verses are a part of mandukya.
Other schools can neglect OM as they do not chant it. Dvait and visistadvaita founders have written commentaries only because they have to defend their faiths against advaita.
Other than that, they do not even refer to other gitas like Uttara Gita, Anu Gita and Uddhava Gita as they talk of either advaita or Yog, both leading to advaita state. They talk about a verse from padma purana, but same padma purana has Shiva Gita in which Shiva shows same Virat svarupa (chapter 7) and pulls all gods within him. Rama is given divine eyes to see this form. Again Shiva talls Rama that he is the lord of universe and Rama says he is both saguna and nirguna. (all in chapter 7). If we take a discource between shiva and parvati as authentic, then Guru Gita talks of Shiva = parvati as own self in different form and that there is no difference between shiva and guru tatva.
Lord DattAtraya is 6th avatar of Lord Vishnu according to bhagavata, vaishnavas do not refer to avadhoot gita and jivan mukta gita. The very first verse is advaitic. Of course I am not mentioning Yog vasistha which is said by Sri Rama's Guru vasistha, forget ashtavakra gita.
The thing is that for vaishnav bhakti, these texts are not required hence not commented Upanishads are considered as an authority and hence to defend their faith and philosophy, vaishavas founders of dvaita and visistadvaita schools hav written commentaries. Same is with brahmasutra.
Infact the advaita in srimad bhagavat is not even discussed. Most of them skip it like 10:14.22 - 10:14.28 (Lord Brahma's Pyayers).
I am not attacking them, my point is that why do we need to discuss about an authority of an upanishad which is not daily inspiration and is not applied practically by dvaita, VA, shuddha advaita and Shri Chaitanya Mahaprabhu and his followers.
Shastras cover every aspect of life. They cover every type of people i.e. people with different prakruti and are at different state of evaluation (mental purity). To those whose consciousness is strongly embedded into physical body to them accepting God as formless is very difficult (BG 12:5 - maybe). To cover these people there is dvaita and DA.
Sri Ramakrishna once said:
Once as person passing by Hanuman asked, Oh brother, what is date today. Shri Hanuman ji replied, arre bhai (oh brother), I do not remember any date, nor I know what is the position of graha and nakshtra (planetary position). I only chant Gods name
This is the mental state of a bhakta.
More to think and give importance or in better words 'tAdAtmya' i.e. attach, cling to or identify ourselves 'I' with sarira bhava, that bhava is more strongly embedded within them. More you think of yourself as jiva, you become jiva (strongly identify yourself as jiva). The more you think of yourself as Atman / Brahman (brahmabhava, more strongly you identify yourself with Brahman
Sri Ramakrishna said,
Once Sri RAma asked hanuman how do you see me
Hanuman replied:
As a body, I am your dAsa (servant) and you are my lord (master, swami)
As a jiva, I am part and you are whole
But from Tatva Jnana, hey Rama, I am you and you are me, are both are same. We are not different.
So let others follow the path and philosophy they like and let advaita calmly practice their path. I do not see any point in comparing or questioning authority of shastras done by extrovert mind (scholars - pothI pandits) nor by people who do not read it or apply it in their daily life.
The accusing part is not done by founders. Even chaitanya mahaprabhu, who transformed 2 sinners, cannot have lower emotions like hatred and accusing. They all have dayA (compassion). They are always post and decent in speech and actions, as they are role models whom people will follow. Instead of fighting and dating shastras which are apaurusheya (unauthored), dating on basis of when they were penned down makes no sense to an advaitin. As an advaitin I would focus more on how can I apply it in daily life. What difference does it make if Gita was written yesterday evening? Gita gives space to interprete in many ways, yoga, advaita, dvaita, visistasvaita, etc. Hence it is most commented. Krishna kept that space so as to cover people of all types of temperaments - karma, bhakti, Jnana, Yog.
Advaita shastras should be discussed for removing doubts by and amongst fellow advaitins. As advaitains we calmly allow others to practice sAkAra bhakti.
Advaita does not reject dvaita. It simply asks one to rise above it. Some statements are given for encouragement, some are said from standpoint of supreme reality, some from jiva bhava, some act as reference. One has to rise from duality and enter advaita sthiti, not necessarily by advaita way. Advait is straight path. On can enter through yoga and even bhakti. Naramsimh Mehta, Swami RAmasukhdAs ji (rAma bhakta)are e.g. of jnani bhakta. It's negation and not rejection.
Always ask the question WHY? Why is is advised to renounce. Why i this world said to be full of sorrow, temporary and illusionary, unsteady. How will this help me to progress in meditation?
Dive deep within, surrender unconditionally and you will find solution.
Coming back to topic. All 12 verses of mandukya are of upanishad and not karika. Forget accusing.
Maudukya upanishad, as said in muktika upanishad alone is enough for salvation. Mandukya explains OM and takes one above duality, triad and maya. As one progress in mediation, peace and bliss (resulting out of vivekyukta vairagya) increases and keeps flowing. Chanting of OM will uproot all thoughts.
OM is imperishable says Krishna
17. The syllable (Aum) with which the Vedas begin, which figures in the middle of the Vedas, and with which the Vedas end, unites Prakrti with its Own Self; but that which is beyond this Prakrti-united-Pranava is Mahesvara.
ARJUNA ASKED:
48. It is evident that the letters are pronounced by means of the teeth, lips, palate, throat, etc.; therefore how can they (letters) be termed indestructible (Nitya), when their destructibility is apparent on their very face?
SRI BHAGAVAN SAID:
49. That letter is called indestructible which is self-pronunciation, i.e., without the effort of any pronunciation, which is neither vowel nor consonant, which is beyond the eight places of pronunciation, which is not subject to long or short accents, and which is thoroughly devoid of the Usma Varnas (i.e, the four letters, S’a, Sa, Sa, Ha, called Usma on account of their pronunciation depending greatly on the help of Vayu or air – meaning, therefore, subject to no air or breath).
Yogis can hear OM. One does not need to chant it. Not by chanting mantra, but by observing mantra one can go into it's source which is brahman like by hearing sound of waves and going in it's direction, one can reach sea shore says Sri Ramakrishna. (going into source is said by Sri Ramana Maharshi).
OM continues by itself, but one needs mental purity and God and Guru's grace to meditate a-japA japa. When one can increase time of meditation and finally experience nirvikalp samadhi.
AUM
Amrut
Hope I have not bored you all with long essay
. What can I do, it flows form my heart and I get lost. So there i repetition and typos. More I edit, more I add instead of removing content. So I leave it as it is. I only correct typos if I spot them while skimming.