What is bhakti?

Rūpa Gosvāmī gives the following definition of bhakti in Bhakti-rasāmṛta-sindhu:

ānukūlyena kṛṣṇānu-
śīlanaṁ bhaktir uttamā

anya-abhilāṣitā-śūnyam — without desires other than those for the service of Lord Kṛṣṇa, or without material desires (such as those for meat-eating, illicit sex, gambling and addiction to intoxicants); jñāna — by the knowledge of the philosophy of the monist Māyāvādīs; karma — by fruitive activities; ādi — by artificially practicing detachment, by the mechanical practice of yoga, by studying the Sāṅkhya philosophy, and so on; anāvṛtam — not covered; ānukūlyena — favorable; kṛṣṇa-anuśīlanam — cultivation of service in relationship to Kṛṣṇa; bhaktiḥ uttamā — first-class devotional service.

When first-class devotional service develops, one must be devoid of all material desires, knowledge obtained by monistic philosophy, and fruitive action. The devotee must constantly serve Kṛṣṇa favorably, as Kṛṣṇa desires.

CC Madhya 19.167

Srila Prabhupada elaborates on this verse in the introduction to Nectar of Devotion.

Read the following excerpt from the Nectar of Devotion — Introduction, then answer the following:

  1. In the table below, select the 3 primary characteristics of bhakti.

What is bhakti?