To attain this Perfection of Bhakti-Yoga, you require Strength from Balarama

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Srila Prabhupada, Mayapur, March 31, 1975: […] Jnana, karma, and hatha-yoga, they can help little, but they are not competent to approach the Supreme Personality of Godhead. Krishna says in the Bhagavad-gita, bhaktya mam abhijanatievam [Bg. 18.55] If you want to know Krishna, then karma, yoga, jnana, these, although they can elevate you to some extent, but you cannot approach the Supreme Personality of Godhead by karma, jnana, yoga. If you want to know Krishna as He is, then you have to accept the path of bhakti-yoga. Krishna says personally, bhaktya mam abhijanati yavan yas casmi tattvatahevam prasanna-manaso. And in order to attain this perfection of bhakti-yoga, you require strength from Balarama, Sankarsana.

ramante yoginah anante satyanande cid-atmani iti rama-padenasau param brahmabhidhiyate

Rama means who enjoys. So this word rama is explained in the sastra that one who is expert in enjoying eternal happiness, he is perfect yogi. Full Lecture