All living entities are serving Krishna in different ways, but when they are Krishna conscious, their service is fully manifest. As a flower in the bud gradually fructifies and yields its desired aroma and beauty, so when a living entity comes to the platform of Krishna consciousness, the beauty of his real form comes into full blossom. That is the ultimate beauty and the ultimate fulfillment of desire.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Srimad-Bhagavatam 10.13.51, Purport

Death is not at all pleasing, and since everyone is exactly like a condemned man being led to the place of execution, what possible happiness can people derive from material objects or the gratification they provide?
Lord Sri Krishna
Srimad-Bhagavatam 11.10.20

Although capable of destroying all sins, the remembrance of Lord Vishnu is achieved only with extraordinary effort. On the other hand, one may perform krishna-kirtana simply by moving one’s lips, and thus this process is superior.
Source Unknown
Quoted in Hari-bhakti-vilasa 11.453

When the flame in a lamp burns the wick improperly, the lamp is blackened, but when the lamp is filled with ghee and is burning properly, there is bright illumination. Similarly, when the mind is absorbed in material sense gratification, it causes suffering, and when detached from material sense gratification it brings about the original brightness of Krishna consciousness.
Jada Bharata
Srimad-Bhagavatam 5.11.8

The liberated jiva transcends the confines of his gross and subtle material bodies and acquires a spiritual form luminescent with transcendental luster. This is his intrinsic, supramundane identity. He is a perfect being and resides in the spiritual world, relishing sublime activities and divine bliss at every moment.
Chandogya Upanishad 8.12.3
Quoted in Jaiva Dharma, Chapter 17

In this Kali-yuga, of what use is a collection of hundred or thousands of other scriptures in the home of someone who does not have the scripture SrimadBhagavatam?
Skanda Purana, Vishnu-khanda 5.16.31, 40
Quoted in Sri Tattva-sandarbha, Anuccheda 22

What is the value of religiosity, economic development, and sense gratification to one who has firm devotion for You [the Personality of Godhead], the root of all the worlds? Liberation sits in the palm of his hand.
Sri Vishnu Purana 1.20.27

Knowing the glories of the transcendental name, please describe them. O Lord Vishnu, may we all attain good intelligence dedicated to You.
Rig-veda 1.156.3
Quoted in Baladeva Vidyabhushana’s commentary on Rupa Goswami’s Namashtaka 2