Bhagavad Gita · Chapter 18: Freedom through Renunciation

Bhagavad Gita 18.51

buddhyā viśuddhayā yukto dhṛtyātmānaṃ niyamya ca | śabdādīn viṣayāṃstyaktvā rāgadveṣau vyudasya ca ||

Endowed with a purified understanding, restraining the self with firmness, giving up sound and the other objects of the senses, and casting aside attraction and aversion;

Modern context

A purified understanding, a self held steady, the senses withdrawn from their objects, attraction and aversion set aside. This is the inner preparation. Each step was taught earlier in the Gita; here they come together. 'Casting aside attraction and aversion' is the heart of it. Most of the mind's turmoil comes from wanting and not wanting. When both quieten, clarity follows naturally.