Mandukya Karika, verse 4.54

Sanskrit text, IAST transliteration and English translation

एवं न चित्तजा धर्माश्चित्तं वापि न धर्मजम् ।
एवं हेतुफलाजातिं प्रविशन्ति मनीषिणः ॥ ५४ ॥

evaṃ na cittajā dharmāścittaṃ vāpi na dharmajam |
evaṃ hetuphalājātiṃ praviśanti manīṣiṇaḥ || 54 ||

54. Thus (external) appearances (objects) are not caused by the mind nor is the mind produced by them. Hence men of discrimination hold the principle of the absolute non-evolution or negation of causality.

Shankara Bhashya (commentary)

Thus, for¹ reasons already stated, the mind is verily of the nature of the essence of the Self. External² objects are not caused by the mind nor is the mind the product of the external objects. That is because all (external) entities are mere appearances in Consciousness. Thus neither the (so-called) effect comes from the (so-called) cause nor the cause from the effect. In this way is reiterated the absolute non-evolution of causality. In other words, the knowers of Brahman declare the absence of causality with regard to Ātman.

Anandagiri Tika (glossary)

¹ For, etc.—The reason is that the real nature of Ātman is free from all modifications and not of the nature of an empirical substance.

² External, etc.—The popular belief that the thought of the pot in the potter’s mind is the cause of the pot and that the external pot gives rise to the idea of the pot in the mind is entirely erroneous. For the idea of causality has been proved to be an illusion.