Devotee: "Therefore, to become Kṛṣṇa conscious is the highest stage of yoga, just as when we speak of the Himalayas, we refer to the world's highest mountains, of which the highest peak, Mount Everest, is considered to be the culmination. It is by great fortune that one comes to Kṛṣṇa consciousness, on the path of bhakti-yoga and is well situated according to the Vedic directions. The ideal yogi concentrates his attention on Kṛṣṇa, who is called Śyāmasundara, beautifully colored as a cloud, His lotus-like face effulgent as the sun and His dress brilliant with earrings and His body flower-garlanded. Illuminating all sides is His gorgeous luster, which is called the brahma-jyotir. He incarnates in different forms, such as Rāma, Nṛsiṁha, Varāha and Kṛṣṇa, the Supreme Personality of Godhead. And He descends like a human being as the son of Mother Yaśodā and is known as Kṛṣṇa, Govinda, and Vāsudeva. He is the perfect child, husband, friend, master, and He is full of all opulences and transcendental qualities. If one remains fully conscious of these features of the Lord, he is called the highest yogi. This stage of highest perfection in yoga can be attained only by bhakti-yoga, as is confirmed in all Vedic literature."
Prabhupāda: Bhakti, in the Bhagavad-gītā you'll find, that bhaktyā mām abhijānāti yāvān yaś cāsmi tattvataḥ (BG 18.55). In the beginning Kṛṣṇa says that out of millions of people, one may understand Me actually, factually. And that same factually word is used in the Eighteenth Chapter, that "If one wants to know Me," Kṛṣṇa or God, "then he has to go through the process of bhakti-yoga." Bhaktyā mām abhijānāti yāvān yaś cāsmi tattvataḥ (BG 18.55). That is clearly said. In the Vedas also it is said, simply through bhakti, devotional service, you can attain to the highest perfectional stage. Other yoga system there must be mixture of bhakti. But bhakti-yoga is unadulterated devotion. Therefore this direct process of bhakti-yoga is recommended for this age because they haven't got sufficient time to execute all the paraphernalia any other system of yoga. Thank you very much.