BG 6.34
चञ्चलं हि मनः कृष्ण प्रमाथि बलवद्दृढम् ।
तस्याहं निग्रहं मन्ये वायोरिव सुदुष्करम् ॥
तस्याहं निग्रहं मन्ये वायोरिव सुदुष्करम् ॥
cañcalaṁ hi manaḥ kṛṣṇa pramāthi balavad dṛḍham
tasyāhaṁ nigrahaṁ manye vāyor iva su-duṣkaram
tasyāhaṁ nigrahaṁ manye vāyor iva su-duṣkaram
Word-for-word meanings
kṛṣṇa — O Kṛṣṇa; hi — because; manaḥ — the mind; cañcalam — is naturally unsteady; pramāthi — turbulent; bala-vat — vehement; dṛḍham — [and] obstinate; aham — I; manye — consider; nigraham — the control; tasya — of it; su-duṣkaram — [to be] exceedingly difficult; vāyoḥ iva — just like the wind.
Translation
O Kṛṣṇa, because the mind is naturally unsteady, turbulent, vehement, and obstinate, I consider it exceedingly difficult to control, just like the wind.