The only friend is Kṛṣṇa. One should try to raise the consciousness of the conditioned soul to the platform of understanding that Kṛṣṇa is his actual friend. If one makes friendship with Kṛṣṇa, one will never be cheated, and he will get all help needed. Arousing this consciousness of the conditioned soul is the greatest service, not posing oneself as a great friend of another living entity. The power of friendship is limited. Although one claims to be a friend, he cannot be a friend unlimitedly. There are an unlimited number of living entities, and our resources are limited; therefore we cannot be of any real benefit to the people in general. The best service to the people in general is to awaken them to Kṛṣṇa consciousness so that they may know that the supreme enjoyer, the supreme proprietor and the supreme friend is Kṛṣṇa. Then this illusory dream of lording it over material nature will vanish.
(Srimad Bhagavatam----3:27:4----purport).

"One can understand the Supreme Personality as He is only by devotional service." Prahlāda Mahārāja ultimately instructed his class friends, the sons of the demons, to accept the process of devotional service by preaching the science of Kṛṣṇa consciousness to everyone. Preaching is the best service to the Lord. The Lord will immediately be extremely satisfied with one who engages in this service of preaching Kṛṣṇa consciousness. This is confirmed by the Lord Himself in Bhagavad-gītā (18.69). Na ca tasmān manuṣyeṣu kaścin me priya-kṛttamaḥ: "There is no servant in this world more dear to Me than he, nor will there ever be one more dear." If one sincerely tries his best to spread Kṛṣṇa consciousness by preaching the glories of the Lord and His supremacy, even if he is imperfectly educated, he becomes the dearmost servant of the Supreme Personality of Godhead. This is bhakti.
(Srimad Bhagavatam----7:6:24----purport).

Therefore, the flower and fruit (puṣpa-phalam) have to be obtained as a result of the body. Without the help of the body, that fruit cannot be gained. The Vaiṣṇava philosophy therefore recommends yukta-vairāgya. It is not that all attention should be diverted for the maintenance of the body, but at the same time one's bodily maintenance should not be neglected. As long as the body exists one can thoroughly study the Vedic instructions, and thus at the end of life one can achieve perfection. This is explained in Bhagavad-gītā (B.G.8:6): yaṁ yaṁ vāpi smaran bhāvaṁ tyajaty ante kalevaram. Everything is examined at the time of death. Therefore, although the body is temporary, not eternal, one can take from it the best service and make one's life perfect.
(Srimad Bhagavatam----8:19:39----purport).

"At the last stage of his life Śrī Mādhavendra Purī became an invalid and was completely unable to move, and Īśvara Purī so completely engaged himself in his service that he personally cleaned up his stool and urine. Always chanting the Hare Kṛṣṇa mahā-mantra and reminding Śrī Mādhavendra Purī about the pastimes of Lord Kṛṣṇa in the last stage of his life, Īśvara Purī gave the best service among his disciples. Thus Mādhavendra Purī, being very pleased with him, blessed him, saying, "My dear boy, I can only pray to Kṛṣṇa that He will be pleased with you." Thus Īśvara Purī, by the grace of his spiritual master, Śrī Mādhavendra Purī, became a great devotee in the ocean of love of Godhead." Śrīla Viśvanātha Cakravartī states in his Gurv-aṣṭaka prayer, yasya prasādād bhagavat-prasādo yasyāprasādān na gatiḥ kuto ’pi: ** “By the mercy of the spiritual master one is blessed by the mercy of Kṛṣṇa.
(Sri Caitanya Caritamrta----1:9:11----purport).

Thus they are honored all over the three worlds, and they are worth taking shelter of because they are absorbed in the mood of the gopīs and are engaged in the transcendental loving service of Rādhā and Kṛṣṇa.”
This Kṛṣṇa consciousness movement continues the tradition of the six Gosvāmīs, especially Śrīla Sanātana Gosvāmī and Śrīla Rūpa Gosvāmī. Serious students of this Kṛṣṇa consciousness movement must understand their great responsibility to preach the cult of Vṛndāvana (devotional service to the Lord) all over the world. We now have a nice temple in Vṛndāvana, and serious students should take advantage of it. I am very hopeful that some of our students can take up this responsibility and render the best service to humanity by educating people in Kṛṣṇa consciousness.
(Sri Caitanya Caritamrta----2:23:104----purport).

One can actually draw the attention of the Supreme Personality of Godhead by service. Then one is further empowered by the Lord to act in such a way that everyone can appreciate his service. This is confirmed in the Bhagavad-gītā (4.11): ye yathā māṁ prapadyante tāṁs tathaiva bhajāmy aham. Kṛṣṇa is responsive. If one tries to render his best service to the Lord, the Lord gives him the power to do so. Kṛṣṇa also says in the Bhagavad-gītā (10.10):
teṣāṁ satata-yuktānāṁ bhajatāṁ prīti-pūrvakam
dadāmi buddhi-yogaṁ taṁ yena mām upayānti te
"To those who are constantly devoted to serving Me with love, I give the understanding by which they can come to Me." Śrī Caitanya Mahāprabhu bestowed His special favor upon Śrīla Rūpa Gosvāmī because Rūpa Gosvāmī wanted to serve the Lord to the best of his ability. Such is the reciprocation between the devotee and the Lord in the discharge of devotional duties.
(Sri Caitanya Caritamrta----3:1:197----purport).

How the Kṛṣṇa consciousness movement can attract the attention of the whole world and how each and every man can feel pleasure in this Kṛṣṇa consciousness is stated in the Padma Purāṇa as follows: "A person who is engaged in devotional service in full Kṛṣṇa consciousness is to be understood to be doing the best service to the whole world and to be pleasing everyone in the world. In addition to human society, he is pleasing even the trees and animals, because they also become attracted by such a movement." A practical example of this was shown by Lord Caitanya when He was traveling through the forests of Jhārikhaṇḍa in central India for spreading His saṅkīrtana movement. The tigers, the elephants, the deer and all the other wild animals joined Him and were participating, in their own ways, by dancing and chanting Hare Kṛṣṇa.
(Nectar of Devotion).