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Tattva Bodhaतत्त्वबोधः
Tattva Bodha · passage 17

The causal body

कारणशरीरं किम्? अनिर्वाच्यानाद्यविद्यारूपं शरीरद्वयस्य कारणमात्रं सत्स्वरूपाऽज्ञानं निर्विकल्पकरूपं यदस्ति तत्कारणशरीरम् ।
kāraṇaśarīraṃ kim? anirvācyānādyavidyārūpaṃ śarīradvayasya kāraṇamātraṃ satsvarūpā'jñānaṃ nirvikalpakarūpaṃ yadasti tatkāraṇaśarīram |

What is the causal body? It is of the form of beginningless, unsayable ignorance, the one cause of the other two bodies, the not-knowing of one's own being, undivided in form. That which abides as this is the causal body.

In plain words

What is the causal body (kāraṇa-śarīra)? It is beginningless and indescribable ignorance (avidyā), the sole cause of the other two bodies. It is the not-knowing of one's own true being, without any distinctions. That which exists as this is the causal body.

The terms set down here
  • kāraṇa-śarīra