Bhagavad Gita 2.67 Chapter 2, Verse 67

इन्द्रियाणां हि चरतां यन्मनोऽनुविधीयते ।
तदस्य हरति प्रज्ञां वायुर्नावमिवाम्भसि ॥२.६७॥

indriyāṇāṃ hi caratāṃ yanmano'nuvidhīyate
tadasya harati prajñāṃ vāyurnāvamivāmbhasi

Meaning

Just as wind sweeps a boat away on the water, so even one sense that the mind follows among the wandering senses carries away one's wisdom.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 2.67 (Chapter 2, The Yoga of Knowledge (Sankhya Yoga), Verse 67)