The Lord is not . . . an ingrate to anyone who renders Him some sort of service. The devotees of the Lord who always engage in His loving service are never to be disappointed in the progressive march of devotional service.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Srimad-Bhagavatam 3.3.2, Purport

The Supreme Lord is far away from the vision of the idolaters, but He is very near to the spiritual vision of devotees. Vaishnava dharma alone is the authorized Vedic dharma. Only the Vaishnavas can understand the actual purport of the Vedas.
Srila Bhaktisiddhanta Sarasvati Thakura
Uncommon Dialogues, Discourse 1

By worship of the Lord, who is the source of all beings and who is all-pervading, a man can attain perfection through performing his own work.
Lord Sri Krishna
Bhagavad-gita 18.46

Pure devotional service is so sublime that one can very easily forget the happiness derived from material enjoyment, material liberation and mystic or yogic perfection. Thus the devotee is bound by Krishna’s mercy and His uncommon power and qualities.
Sri Chaitanya Mahaprabhu
Sri Chaitanya-charitamrita, Madhya-lila 24.39

Devotional service is the process of worshiping the Supreme Lord. It consists of fixing one’s mind upon Him by becoming uninterested in all material designations, both in this life and the next. This indeed is true renunciation.
Lord Brahma
Gopala-tapani Upanishad, Purva 15

Although the Lord is always invisible, He can be seen by His own power. Without that power, who could ever see the immortal Supreme Lord, who is the Supreme Self of all beings?
Quoted in Sri Bhagavat-sandarbha, Anuccheda 46

The living being caught in the cycle of birth and death does not know how he can be delivered from the material body, which brings him so much trouble. But You, the Supreme Lord, descend to this world in various personal forms, and by performing Your pastimes You illumine the soul’s path with the blazing torch of Your fame. Therefore I surrender unto You.
Narada Muni to Lord Krishna
Srimad-Bhagavatam 10.70.39

One may give up a family member to save the family, and abandon a family for the sake of the village. One can renounce a village for the sake of the nation, but one must be prepared to sacrifice the entire earth for the sake of the self (atma).
Sri Vidura
Mahabharata, Udyoga-parva 5.37.17

Worship of the Lord continues up to the point of liberation, and indeed goes on in the liberated state also, as the Vedas reveal.
Srila Vyasadeva
Vedanta-sutra 4.1.12

The residents of Vaikuntha transcend everything material. For persons within the material creation, the manifold glories of those residents and the glories of the Vaikuntha world and its master are beyond analogy and beyond the power of words to describe.
Sri Gopa-kumara
Sri Brihad-bhagavatamrita 2.4.40-41