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 affectvāyu - wind; air element

Commentaries and Reflections

Commentary by TKV Desikachar:

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