All these taken together form the linga sarira.** It is also said in the Shastras:—
The five vital airs, manas, buddhi, and the ten organs form the subtile body, which arises from the subtile elements, undifferentiated into the five gross ones, and which is the means of the perception of pleasure and pain.
Q. What is the Karana sarira?
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* The principle of intellect (Buddhi) in the macrocosm. For further
explanation of this term, see Sankara's commentaries on the Brahma
Sutras.
** Linga means that which conveys meaning, characteristic mark. ————
A. It is ignorance [of different monads] (avidya), which is the cause of the other two bodies, and which is without beginning [in the present manvantara],* ineffable, reflection [of Brahma] and productive of the concept of non-identity between self and Brahma. It is also said:—
"Without a beginning, ineffable avidya is called the upadhi (vehicle)— karana (cause). Know the Spirit to be truly different from the three upadhis—i.e., bodies."
Q. What is Not-Spirit?
A. It is the three bodies [described above], which are impermanent, inanimate (jada), essentially painful and subject to congregation and segregation.
———— * It must not be supposed that avidya is here confounded with prakriti. What is meant by avidya being without beginning, is that it forms no link in the Karmic chain leading to succession of births and deaths, it is evolved by a law embodied in prakriti itself. Avidya is ignorance or matter as related to distinct monads, whereas the ignorance mentioned before is cosmic ignorance, or maya-Avidya begins and ends with this manvantara. Maya is eternal. The Vedanta philosophy of the school of Sankara regards the universe as consisting of one substance, Brahman (the one ego, the highest abstraction of subjectivity from our standpoint), having an infinity of attributes, or modes of manifestation from which it is only logically separable. These attributes or modes in their collectivity form Prakriti (the abstract objectivity). It is evident that Brahman per se does not admit of any description other than "I am that I am." Whereas Prakriti is composed of an infinite number of differentiations of itself. In the universe, therefore, the only principle which is indifferentiable is this "I am that I am" and the manifold modes of manifestation can only exist in reference to it. The eternal ignorance consists in this, that as there is but one substantive, but numberless adjectives, each adjective is capable of designating the All. Viewed in time the most permanent object or mood of the great knower at any moment represents the knower, and in a sense binds it with limitations. In fact, time itself is one of these infinite moods, and so is space. The only progress in Nature is the realization of moods unrealized before. ————