It is through the singular means of bhakti that one can perceive face to face the Supreme Personality of Godhead, Krishna, the embodiment of eternity, knowledge, and bliss. When the rising sun chases away the blackness of night, everything becomes clearly visible. Similarly, when the sun of Krishna rises above the horizon of one’s consciousness, the Stygian gloom of maya, the illusory energy, is driven away, and the original form of every object comes into distinct focus.
His Divine Grace A.C. Bhaktivedanta Swami Prabhupada
Renunciation Through Wisdom, p. 61

How can the happiness of bhakti arise in the heart when the witch of desire for enjoyment and liberation remains there?
Srila Rupa Goswami
Bhakti-rasamrita-sindhu 1.2.22

Having awakened faith in the narrations of My glories, being disgusted with all material activities, knowing that all sense gratification leads to misery, but still being unable to renounce all sense enjoyment, My devotee should remain happy and worship Me with great faith and conviction. Even though he is sometimes engaged in sense enjoyment, My devotee knows that all sense enjoyment leads to a miserable result, and he sincerely repents such activities.
Lord Sri Krishna
Srimad-Bhagavatam 11.20.27–28

O Maitreya, King Bharata simply said, “O master of sacrifice, O Acyuta, Govinda, Madhava, Ananta, Kesheva, Krishna, Vishnu, Hrishikesha!” He said nothing else, even in his dreams.
Parashara Muni
Vishnu Purana 2.13.10

I long to see young Krishna, who enchants the universe with His curved black eyebrows, His thick eyelashes, His attractive, shifty eyes, His soft words that melt the heart, His sweet red lips, and the intoxicating sound emanating from the clear notes of His flute.
Bilvamangala Thakura
Krishna-karnamrita 54

One who is engaged in devotional service, either as a sannyasi or as a grihastha, must adhere strictly to the scriptural injunction which prescribes thus: yavannirvaha pratigraha—he should endeavor only for as much as is essentially required in favor of worshiping Sri Hari. His material activities should be neither excessive nor scanty, as either leads to diversion from spiritual progress.
Srila Bhaktisiddhanta Sarasvati Thakura
Upakhyane Upadesha, Lesson 6