श्री भगवानुवाच असंशयं महाबाहो मनो दुर्निग्रहं चलं। अभ्यासेन तु कौन्तेय वैराग्येण च गृह्यते
śhrī bhagavān uvācha asanśhayaṁ mahā-bāho mano durnigrahaṁ chalam abhyāsena tu kaunteya vairāgyeṇa cha gṛihyate
Lord Shri Krishna replied: Doubtless, O Mighty One, the mind is fickle and exceedingly difficult to restrain; however, O Son of Kunti, with practice and renunciation, it can be done.
Translated by Shri Purohit Swami
The Blessed Lord said, "Undoubtedly, O mighty-armed Arjuna, the mind is difficult to control and restless; but with practice and dispassion, it can be restrained."
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
śhrī-bhagavān uvācha—Lord Krishna said; asanśhayam—undoubtedly; mahā-bāho—mighty-armed one; manaḥ—the mind; durnigraham—difficult to restrain; chalam—restless; abhyāsena—by practice; tu—but; kaunteya—Arjun, the son of Kunti; vairāgyeṇa—by detachment; cha—and; gṛihyate—can be controlled