Without Sage Sri, Sankara the Advaitic wisdom is incomplete. Without Advaitic wisdom, it is impossible to realize the truth, which is beyond the form, time, and space. The Advaitic wisdom is the fullness of the truth.
Sage Sri Sankara’s whole teaching can be summed up into one sentence, ‘There is nothing else but Brahman. He says that the Absolute Existence, Absolute Knowledge, and Absolute Bliss are real. The universe is not real. He says that Brahma and Atman are one. The ultimate and the Absolute Truth is the Self, which is one though appearing as many different individuals. The individual has no reality. Only the Self is real; the rest, mental and physical are but passing appearances.
Sage, Sri, Sankara gave religious, ritual or dogmatic instruction to the mass but pure philosophy only to the few who could rise to it. Hence, the interpretation of his writings by commentators is often confusing because they mix up the two viewpoints. Thus, they may assert that ritual is a means of realizing Brahman, which is absurd.
This clearly indicates that religion, which is based on individual conduct, prescribes karma and Upasana to people of lower and middling intellect, therefore religion is for the lower intellect. And wisdom is for those are capable of inquiring into their own existence to know and realize the ultimate truth, which is Brahman.
Sri, Sankara: ~ “The illusion must be transcended by getting rid of the ignorance in order to realize the truth of the Soul which is the ultimate truth or Brahman.
If Brahman is considered the all-pervading consciousness then, it is necessary to realize, the consciousness as the Self, which pervades all the three states, to realize the fact that, there is no second thing exists other the consciousness. Thus, consciousness (Atman) is the ultimate truth (Brahman).
Genuine philosophy must be independent of religion, that in Sage Sri, Sankara himself the Saguna Brahman or a personal God is only a part of the phenomenal (if not illusory) world, and the Nirguna Brahman is the only reality and has nothing to do with religion.
Sage Sri Sankara pokes fun at ascetics and points out that all their austerities do not cause desires to go (Altar Flowers" Page 205, v.2 P.207 v.4)
The Brahma Sutras together with Sage Sri Sankara's commentary thereon do not contain the higher wisdom. They are intended for those who are incapable of thinking rationally.
Sage Sri, Sankara's commentary on the Brahma Sutras is not on a philosophical basis, but on an orthodox and mystic basis, with an appeal to the Vedas as final authority.
In Brahma Sutra Sage Sri, Sankara takes the position that there is another entity outside us, i.e. the wall really exists separately from the mind. This was because Sage Sri, Sankara explains in Manduka that those who study the Sutras are orthodox minds, intellectual children, hence his popular view point to assist them. These people are afraid to go deeper because it means being heroic enough to refuse to accept Sruti, and God's authority, in case they mean punishment by God. A Gnani says the scriptures for children, but wise seekers will think rationally.
In Brahma Sutras Sage Sri, Sankara takes for granted, assumes that a world was created: He there mixes dogmatic theology with philosophy.
That God created the world is an absolute lie, nevertheless one will find Sage Sri, Sankara (in his commentary on Vedanta Sutras) clearly says this! He has to adapt his teachings to his audience, reserving the highest for philosophical minds.
The text of Brahma Sutras is based on religion, dogmatism, but in the commentary Sage Sri, Sankara cleverly introduced some philosophy. If it is objected that a number of Upanishads are equally dogmatic because they also begin by assuming Brahman, only a few Upanishads do not, but prove Brahman at the end of a train of proof.
Scholars translation of Brahma Sutras in Sacred Books of East must be read cautiously as he has not understood its highest sense, e.g. for Advaita they wrongly put "Unity" instead of “Non-duality."
Sage Sri Sankara gave religion and scholasticism and yoga no less than philosophy, to the seeking world. He was great enough to be able to do so. His commentary on Manduka is pure philosophy, but many of his other books are presented from a religious standpoint to help those who cannot rise up to philosophy.
Orthodoxy is the home of mysticism and deification that is why they are not keen rational truth. Thus, Sage Sankara is the Jagadguru to the religious followers and he is a great Sage (Gnani) of the highest order to the seeking world.