SB 1.2 - Faith in the topics of the Lord
The qualification for bhakti is faith in the topics of the Lord. Kṛṣṇa confirms saying that having developed faith in topics about the Lord and being disgusted with all karmas, a devotee knows that all enjoyments are filled with misery. But he is unable to give them up. Still, with affection for the Lord, with faith and determination, the devotee will continue to worship Kṛṣṇa at the same time (SB 11.20.27-28). Faith in the Lord arises by remembering the Lord. The sword of remembering the Lord cuts the knot of prārabdha-karma. Even before having faith attraction for topics about the Lord arises suddenly in all people. This shows a person who has faith will be even more attracted.
But we are so unfortunate that we do not have a taste to hear and chant about Kṛṣṇa. Bhaktivinoda Ṭhākura lists four causes of this misfortune: tattva-brahma – philosophical misunderstandings based on illusion about our identity, illusion about the Lord, illusion about sādhana and prema bhakti, and illusion about subjects unfavorable to Kṛṣṇa consciousness; aparādha – offenses towards the Lord’s name, form, devotees and other living entities; asat-tṛṣṇā – ‘thirst for the temporary’, or desires for material objects, heavenly comforts, mystic powers, and impersonal liberation; hṛdaya-daurbalyam – ‘weakness of heart’, or deceit, faultfinding, envy, desire for fame and attachment to objects unrelated to Kṛṣṇa.