To see God everywhere and in every living entity is not the final word in self-realization; one needs to see Him in all events, in every activity, in every thought influencing everyone’s life, including one’s own. Two things are indispensable for acquiring such a vision: first we must offer the results of all our activities to Lord Krishna, and second, every action we perform must be done exclusively as devotional service to Him.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Renunciation Through Wisdom, Chapter 5
O Lord Narahari, persons who have attained this human form live uselessly, merely breathing like bellows, if they fail to worship You by hearing about You, chanting Your glories, remembering You, and performing the other devotional practices.
Srila Sridhara Svami
Commentary on Srimad-Bhagavatam 10.87.17
All you sons of immortality, hear, you who once resided in the divine kingdom.
Svetashvatara Upanishad 2.5
All different varieties of atmaramas [those who take pleasure in atma, or spirit self], especially those established on the path of self-realization, though freed from all kinds of material bondage, desire to render unalloyed devotional service unto the Personality of Godhead. This means that the Lord possesses transcendental qualities and therefore can attract everyone, including liberated souls.
Srila Suta Goswami
Srimad-Bhagavatam 1.7.10
Causeless devotional service is unmotivated by sense enjoyment, perfection, or liberation. When one is freed from all these contaminations, he can bring Lord Krishna, who is very funny, under control.
Sri Chaitanya Mahaprabhu
Sri Chaitanya-charitamrita, Madhya 24.29
One is truly a Vaishnava who has given up the habit of falling victim to the ferocious tigress of wealth, beauty, and fame. Such a soul is factually detached from material life and is known as a pure devotee. Someone with this consciousness of detachment has thereby become victorious over the mundane world of birth and death.
Srila Bhaktisiddhanta Sarasvati Thakura
Dushta Mana 11
Dear mind, if you have any excess wealth, then just become humble and use that wealth to do something beneficial for the service of the Vaishnavas. Constantly showing compassion to all souls, worship Radha-Krishna and always make your standard of behavior clean, saintly, and virtuous.
Srila Bhaktivinoda Thakura
Kalyana-kalpataru 12.4