Prabhupāda: This system of yoga, this aṣṭāṅga-yoga. Yes.
Revatīnandana: "In fact, we do not find any record in history of his practicing it at any time. Therefore this system must be considered impossible, especially in this Age of Kali. Of course, it may be possible for some very few, rare men, but for the people in general it is an impossible proposal. If this was so five thousand years ago, then what to speak of the present day? Those who are imitating this yoga system in different so-called schools and societies, although complacent, are certainly wasting their time. They are completely in ignorance of the desired goal."
Prabhupāda: Yes. So this aṣṭāṅga-yoga is not possible. Therefore this yoga system, bhakti-yoga system, is applicable to anyone. You have seen when this chanting, bhakti-yoga system, goes on, even a small child, he also begins to clap. You see? Without any training, without any education, automatically he takes part.
So therefore Lord Caitanya has said that this is the only system in this age, harer nāma harer nāma harer nāma eva kevalam (CC Adi 17.21).
Simply chanting Hare Kṛṣṇa, Hare Kṛṣṇa, kalau, in this Age of Kali, kalau nāsty eva, nāsty eva, nāsty eva: there is no other alternative, no other alternative, no other alternative. If you adopt this system, this bhakti-yoga system, very simple, simply chant, you'll find immediately result. Pratyakṣāvagamaṁ dharmyam (BG 9.2).