BG Chap 9 - More Characteristics of bhakti
(e) Joyful to perform
Bhakti is joyfully performed. Bhakti destroys all karmas, yields perception of Bhagavān and is easy to execute. Devotional service consists of śravaṇaṁ kīrtanaṁ viṣṇoḥ [SB 7.5.23], so one can simply hear the chanting of the glories of the Lord or can attend philosophical lectures on transcendental knowledge given by authorized ācāryas. Simply by sitting, one can learn; then one can eat the remnants of the food offered to God, nice palatable dishes. In every state devotional service is joyful. Bhakti yoga is joyfully performed because it entails using our senses in Kṛṣṇa’s service, and does not require renouncing our activities as in jñāna yoga. Renouncing sense activities does not bring joy but rather, dryness and misery.
(f) Eternally performed
Bhakti is indestructible and exists even in liberation. Being beyond the guṇas it is eternal. Karma yoga does not destroy all karmas until it turns to jñāna. Jñāna yoga and aṣṭāṅga-yoga are not easy to execute and are given up on liberation. But bhakti continues after liberation. Karma yoga indirectly leads to perception of ātmā, and jñāna yoga and aṣṭāṅga-yoga give perception of the ātmā and Paramātmā but not Bhagavān.