On Advaita Vedanta: From the gross to the subtle

The following excerpt is from a samvaad (dialogue) session with Acharya Prashant.

क्रियानाशाद्भवेच्छिन्तानाशोऽस्माद्वासनाक्षयः ।
वासनाप्रक्षयो मोक्षः सा जीवन्मुक्तिरिष्यते ॥

kriyānāśādbhavecchintānāśo’smādvāsanākṣayaḥ
vāsanāprakṣayo mokṣaḥ sā jīvanmuktiriṣyate

The destruction of action leads to that of thought; thence results the dwindling of innate impulse (to act). The obliteration of innate impulse is liberation; it is held to be freedom in life.

~ Adhyatma Upanishad, Verse 12

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Questioner (Q): I am aware that I have innate impulses like anger, greed, fright, fear, and attachments. Kindly help me understand what is this process of dwindling innate impulses, as mentioned in this verse.

Acharya Prashant (AP): It is the path, the method that proceeds from the gross and goes towards the subtle. This method is for those who cannot begin from the subtle-most.