A living entity becomes established in spiritual, blissful life when he fully understands that his happiness depends on spiritual self-realization, which is the basic principle of ananda (bliss), and when he is eternally situated in the service of the Lord, who has no other lord above Him.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Srimad-Bhagavatam 5.19.20, Purport

We should show compassion toward all living entities, develop a taste for chanting the Lord’s names, and serve Vaishnavas. These are Mahaprabhu’s three principal instructions.
Srila Bhaktisiddhanta Sarasvati Thakura
Amrita Vani

Mother Earth is immediately purified by the touch of the dust from the feet of the Vaishnavas who dance to the sound of sankirtana.
Sri Narada-pancaratra

The Supreme Personality of Godhead fulfills the material desires of a devotee who approaches Him with such motives, but He does not bestow benedictions upon the devotee that will cause him to demand more benedictions again. However, the Lord willingly gives the devotee shelter at His own lotus feet, even though such a person does not aspire for it, and that shelter satisfies all his desires. That is the Supreme Personality’s special mercy.
The Demigods in Heaven
Srimad-Bhagavatam 5.19.27

Whatever you do, whatever you eat, whatever you offer or give away, and whatever austerities you perform—do that, O son of Kunti, as an offering to Me. In this way you will be freed from bondage to work and its auspicious and inauspicious results. With your mind fixed on Me in this principle of renunciation, you will be liberated and come to Me.
Lord Sri Krishna
Bhagavad-gita 9.27–28

The fire of digestion digests food, and the person eating does not know how the food gets digested. Similarly, bhakti liberates the devotee who daily performs hearing and chanting and experiences a sweet taste, without striving for liberation at all. The devotee does not even ask how or when he will get liberation.
Srila Vishvanatha Chakravarti Thakura
Srimad-Bhagavatam 3.25.33, Commentary

By serving You [Krishna] constantly, one is freed from all material desires and is completely pacified. When shall I engage as Your permanent eternal servant and always feel joyful to have such a fitting master?
Stotra-ratna 43