Kṛṣṇa delivers His verdict on the necessity of discipline. He says that for someone whose mind is unbridled and uncontrolled, self-realization is an impossible task. No amount of rituals or reading can help if the mind is running wild. This is a cold, hard fact of spiritual life. However, for the person who has a controlled mind (‘vaśyātmanā’) and who strives by ‘appropriate means’, success is guaranteed. Kṛṣṇa is emphasizing that yoga is a systematic process, not a matter of luck or sentiment. There are specific ‘upāyataḥ’—methods and means—that work. He is putting the power back into Arjuna’s hands. He is saying, “If you don’t control your mind, you will fail. But if you do the work, you will definitely succeed.” Kṛṣṇa’s ‘opinion’ is the law of the universe: internal discipline is the mandatory entrance fee for the kingdom of peace and knowledge. One must become the boss of their own brain.