Caitanya-caritāmṛta 4.79
bhakta-bhakti-kṛṣṇaprema-tattvera nirdhāra vaiṣṇavera kṛtya, āra vaiṣṇava-ācāra
[bhakta-bhakti-krishnaprema-tattvera nirdhaara vaishnavera kritya, aara vaishnava-aachaara]
Blended reading (Sanskrit + English inline)
bhakta-bhakti-kṛṣṇaprema-tattvera nirdhāra vaiṣṇavera kṛtya, āra vaiṣṇava-ācāra
“You shall have to ascertain the basic principles of a devotee, devotional service, love of Godhead, Vaiṣṇava duties and Vaiṣṇava characteristics.
My note
Source: vedabase.io