Bhagavad Gītā Chapter Six verse 34

cañcalaṃ hi manaḥ kṛṣṇa pramāthi balavad dṛḍham |
tasyāhaṃ nigrahaṃ manye vāyor iva suduṣkaram ||

manas - mind; that which objects of sense affect; the faculty or instrument through which thoughts entervāyu - wind; air elementkṛṣṇa - black, dark, dark-blue; name of a celebrated Avatār of the god Viṣṇu, or sometimes identified with Viṣṇu himselfdṛḍha - firm; solid

Commentaries and Reflections

Commentary by TKV Desikachar:

“Any attempt to meditate is going to fail if you are sitting on a pile of junk.”