यस्त्वविज्ञानवान्भवत्ययुक्तेन मनसा सदा । तस्येन्द्रियाण्यवश्यानि दुष्टाश्वा इव सारथेः ॥ ५॥

ॐ

English Translation

If the buddhi, being related to a mind that is always distracted, loses its discriminations, then the senses become uncontrolled, like the vicious horses of a charioteer. 

ॐ

English Commentary

This being so, of that driver known as Buddhi, who is not capable of discrimination as to what is to be done or omitted to be done, as the other driver in the guiding of his chariot has a mind like the reins of a chariot not well-grasped by the driver, i.e., uncontrolled by the intellect; of that incompetent driver, i.e., intellect, the senses which stand in the place of the horses become unruly and uncontrollable, as the vicious horses of the other driver.

Sri Shankaracharya