If one offers Me with love and devotion a leaf, a flower, fruit or water, I will accept it.
(Bhavavad-Gita-9:26).

The devotees of the Lord are always in the heart of the Lord, and the Lord is always in the hearts of the devotees. That is the sweet relation between the Lord and His devotees. Due to unalloyed love and devotion for the Lord, the devotees always see Him within themselves, and the Lord also, although He has nothing to do and nothing to aspire to, is always busy in attending to the welfare of His devotees.
(Srimad Bhagavatam-1:9:47-purport).

When Uddhava was sent by Kṛṣṇa to see the condition of the gopīs in Vṛndāvana, he stayed there for a few months in their association and always talked with them about Kṛṣṇa. Although this greatly pleased the gopīs and other residents of Vrajabhūmi, Vṛndāvana, Uddhava saw that the gopīs were severely afflicted by their separation from Kṛṣṇa. Their hearts were so disturbed that their minds were sometimes deranged. Observing the unalloyed devotion and love of the gopīs for Kṛṣṇa, Uddhava desired to become a creeper, a blade of grass or an herb in Vṛndāvana so that sometimes the gopīs would trample him and he would receive the dust of their lotus feet on his head.
(Srimad Bhagavatam-3:7:47-purport).

A professional speaker cannot impress transcendental ecstasy within the hearts of the listeners. However, when a realized soul who is engaged in the service of the Lord is speaking, he has the potency to inject spiritual life within the audience. One should, therefore, seek the association of such pure, unalloyed devotees, and by such association and service a neophyte devotee will certainly develop attachment, love and devotion for the Supreme Personality of Godhead.
(Nectar of Devotion).

The two transcendental brothers, Kṛṣṇa and Balarāma, were naturally beautiful and had beautiful complexions, and They were nicely dressed in colorful garments. The upper portions of Their bodies were already very attractive, and when the hunchbacked woman smeared Their bodies with sandalwood pulp, They looked even more beautiful. Kṛṣṇa was very much pleased by this service, and He began to consider how to reward her. In other words, in order to draw the attention of the Lord, the Kṛṣṇa conscious devotee has to serve Him in great love and devotion.
(Krsna Book).

Lord Kṛṣṇa is unborn, yet He can accept any form imaginable. And because He is the supreme father of every living being, anyone—whether a high-born brāhmaṇa or a social outcast—can offer Him a flower, a fruit, a leaf, and water with love and devotion. Then Lord Kṛṣṇa, the cause of all causes, will accept this offering, and by such spiritual activity the worshipper becomes eligible to enter His eternal abode.
(Renunciation Through Wisdom).

Understanding the mind of Sudāmā Vipra, the Lord said, "My dear friend, I am certainly not in need of anything, but if My devotee gives Me something as an offering of love, even though it may be very insignificant, I accept it with great pleasure. On the other hand, if a person is not a devotee, even though he may offer Me very valuable things, I do not like to accept them. I actually accept only things offered to Me in devotion and love; otherwise, however valuable a thing may be, I do not accept it. If My pure devotee offers Me even the most insignificant things—a little flower, a little piece of leaf, a little water—but saturates the offering in devotional love, then not only do I gladly accept such an offering, but I eat it with great pleasure."
(Krsna Book).