One verse

Bhagavad Gita 2.67

2.67

इन्द्रियाणां हि चरतां यन्मनोऽनुविधीयते | तदस्य हरति प्रज्ञां वायुर्नावमिवाम्भसि ||२-६७||

indriyāṇāṃ hi caratāṃ yanmano.anuvidhīyate . tadasya harati prajñāṃ vāyurnāvamivāmbhasi ||2-67||

indriyāṇām
of the senses
hi
certainly
caratām
while roaming
yat
with which
manaḥ
the mind
anuvidhīyate
becomes constantly engaged
tat
that
asya
his
harati
takes away
prajñām
intelligence
vāyuḥ
wind
nāvam
a boat
iva
like
ambhasi
on the water

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 a man’s intelligence.