Vaishnava Samhita. Raskhan Charitam. Vol III Book VII Chp 13 Shlokas 3 - 4

भजन्ति श्रद्धया विष्णुं चण्डालाश्चापि पामराः |

मुह्मन्ति वेदशास्त्रज्ञा विप्राः पण्डितमानिनः ||

अधीत्या वेदान्निखिलान् कृत्वा कर्माणि सर्वशः |

यस्य कृष्णे रतिर्णास्ति स शूद्रो ब्राह्मणोपि सन् ||

Even the ignorant chandalas worship Lord Vishnu very dedicatedly. But the brahmanas who are well-versed in Vedas and Shastras go about puffed with pride. Even if one is a brahmana by birth and is engaged in the study of the Vedas and the performance of religious rituals, one is taken to be only a shudra if one is not endowed with Krishna bhakti.