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Teachings of Lord Chaitanya
Eighteenth Chapter, 65th verse. The Lord said there: "My dear Arjuna, you are My affectionate friend and relative, and therefore, for your benefit, I am giving you the most confidential knowledge: Just become always mindful of Me, become always a devotee of Mine, become a constant worshipper of Me, and just become a soul surrendered to Me. That is the only way by which you can achieve My Abode. Because you are My very dear friend, My most confidential knowledge is disclosed herewith to you."
Such a direct instruction of Krishna to Arjuna is more important than any Vedic injunctions or regulative service. There are certainly many Vedic injunctions, such as ritualistic performances, sacrificial performances, regulative duties, meditation, and the speculative process of knowledge; but Krishna's direct order—"You just give up everything and become My devotee, My worshipper"—should be taken as the final order of the Lord, and one should follow that principle.
If one is convinced by this direct order of the Lord in the  Bhagavad Gita , and becomes attached to His devotional service and gives up all other engagements, then he undoubtedly becomes successful.  Srimad Bhagwatam  also says, to confirm this statement, that one should be engaged in other paths of self-realization only so long as one is not convinced by the direct order of the Lord, Sri Krishna. As stated in  Srimad Bhagwatam  and  Bhagavad Gita , the direct order of the Lord is to give up everything and be engaged in devotional service.
This firm conviction is known as faith. Faith means that one is firmly convinced that, simply by devotional service to Lord Krishna, everything else is performed—including the regulative principles of ritualistic duties, sacrifices, performance of Yoga, and the speculative pursuit of knowledge. Everything else is performed if one is convinced that devotional service to the Lord includes everything. This is also found in the  Srimad Bhagwatam , Fourth Canto, Thirty-first Chapter. It is said there: "As by watering the root of the tree the branches, the twigs, the leaves, and the fruits become nourished; and as in supplying foodstuffs to the stomach all the senses become satisfied—similarly, simply by devotional service to Krishna, all other worship and all other processes are completed." Such a faithful and firmly convinced person is eligible to be elevated as a pure devotee.
Now, amongst the devotees there are three classes, according to the degree of conviction: The first class devotee is one who is conversant with all kinds of Vedic literature, and at the same time has the firm conviction mentioned above. He is a first class devotee, and he can deliver all others from the pangs