Who is such a fool that he does not want to be Kṛṣṇa conscious by this simple method and thus attain the highest perfectional life of eternity, bliss and knowledge? Kṛṣṇa wants only loving service and nothing more. Kṛṣṇa accepts even a little flower from His pure devotee. He does not want any kind of offering from a nondevotee. He is not in need of anything from anyone, because He is self-sufficient, and yet He accepts the offering of His devotee in an exchange of love and affection.
(Bhagavad-Gita---9:26---purport).

The Lord is the absolute form of eternity, bliss and knowledge. As such, transcendental loving service to the Lord in one of the five principal relations, namely śānta, dāsya, sakhya, vātsalya and mādhurya, i.e., neutrality, servitorship, fraternity, filial affection and conjugal love, is graciously accepted by the Lord when offered to the Lord in genuine love and affection.
(Srimad Bhagavatam---1:9:34---purport).

The Lord is sometimes addressed as uttamaśloka, which means "one who is worshiped with selected words by devotees." A profusion of such selected words comes from a devotee who is fully absorbed in affection and love for the devotional service of the Lord.
(Srimad Bhagavatam---3:8:6---purport).

Those who constantly engage in the devotional service of the Lord in love and affection are directly in contact with the Supreme Personality of Godhead sitting as the Supersoul in everyone's heart. The Lord is not far away from the devotee. He is always in everyone's heart, but only the devotee can realize the Lord's presence, and thus he is directly connected, and he takes instruction from the Lord at every moment.
(Srimad Bhagavatam---4:20:20---purport).

With love and affection, one should try to give something to Kṛṣṇa from one's source of income. Then one's life will be successful. Kṛṣṇa is full in all opulences; He does not need anything from anyone. But if one is prepared to give something to Kṛṣṇa, that is for one's own benefit.
(Srimad Bhagavatam---10:11:11---purport).

Sometimes a confidential friend would come before Kṛṣṇa and embrace Him with great affection and love. Another friend would then come up from the rear and cover Kṛṣṇa's eyes with his hands. Kṛṣṇa would always feel very happy by such dealings with His confidential friends.
(Nectar of Devotion).

Similarly, the Lord fulfills the desire of everyone according to his position, yet one who is not in Kṛṣṇa consciousness considers all the gifts of the Lord to be less than his desire. On the other hand, when the Lord receives a little thing in love and affection from His devotee, He considers it a great and valuable gift.
(Krsna Book).