Bhagavad Gita: Chapter 2, Verse 67

इन्द्रियाणां हि चरतां यन्मनोऽनुविधीयते ।
तदस्य हरति प्रज्ञां वायुर्नावमिवाम्भसि ॥ २-६७ ॥

indriyāṇāṁ hi caratāṁ yan mano ’nuvidhīyate
tad asya harati prajñāṁ vāyur nāvam ivāmbhasi 2.67

As a strong wind sweeps away a boat on the water, even one of the roaming senses on which the mind focuses can carry away one’s intelligence.