Sanskrit

चञ्चलं हि मनः कृष्ण प्रमाथि बलवद्दृढम्। तस्याहं निग्रहं मन्ये वायोरिव सुदुष्करम्।।6.34।।

Summary

My Lord! Verily, the mind is fickle and turbulent, obstinate, and strong; indeed, it is extremely difficult to control, like the wind.