Again, offering obeisances unto all you brāhmaṇas, I pray that if I should again take my birth in the material world I will have complete attachment to the unlimited Lord Kṛṣṇa, association with His devotees and friendly relations with all living beings.

That a devotee of the Lord is the only perfect living being is explained herein by Mahārāja Parīkṣit. A devotee of the Lord is no one's enemy, although there may be many enemies of a devotee. A devotee of the Lord does not like to associate with nondevotees, although he has no enmity with them. He desires association with the devotees of the Lord. This is perfectly natural because birds of the same feather mix together. And the most important function of a devotee is to have complete attachment for Lord Śrī Kṛṣṇa, the father of all living beings. As a good son of the father behaves in a friendly way with all his other brothers, so also the devotee of the Lord, being a good son of the supreme father, Lord Kṛṣṇa, sees all other living beings in relation with the supreme father. He tries to bring back the upstart sons of the father to a saner stage and to get them to accept the supreme fatherhood of God. Mahārāja Parīkṣit was certainly going back to Godhead, but even if he were not to go back, he prayed for a pattern of life which is the most perfect way in the material world. A pure devotee does not desire the company of a personality as great as Brahmā, but he prefers the association of a petty living being, provided he is a devotee of the Lord.
(Srimad Bhagavatam--1:19:16--translation and purport).

The process is the mind has to be cleansed of all dirty things. Mind is the friend; mind is the enemy of everyone. If it is cleansed, then it is friends, and if it is dirty... Just like if you keep yourself unclean, then you contaminate some disease. And if you keep yourself clean, then you don't contaminate. If you take action, remaining... Therefore according to Vedic civilization, one has to cleanse himself three times a day, tri-sandhyā. Morning, early in the morning, again at noon, again in the evening. Those who are strictly following the brahminical rules and regulations... Vaiṣṇava also. Vaiṣṇava means he's already brāhmaṇa. So he must follow the rules and... Satyaṁ śamo damas titikṣā ārjavaṁ jñānaṁ vijñānam āstikyam... [Bg. 18.42]. So cleanliness is next to godliness. So the... Actually, our material conditioned life means the mind is covered with dirt, all unclean, dirty things. That is the disease. When we are in the lower stage of tamo-guṇa and rajo-guṇa, these dirty things are very much prominent. Therefore one has to raise himself from the position of tamo-guṇa and rajo-guṇa to sattva-guṇa. The process is recommended, how to cleanse the mind: śṛṇvatāṁ sva-kathāḥ kṛṣṇaḥ puṇya-śravaṇa-kīrtanaḥ [SB 1.2.17]. One has to hear the kṛṣṇa-kathā.
(Lecture on Srimad Bhagavatam--3:25:16--Bombay--16th. November, 1974).

One householder devotee once said, "My Lord, I am so wretched that these two eyes are never desiring to see the glorious city of Mathurā. Therefore, my eyes are actually condemned. I am nicely educated, but my education has simply been used in government service. I have not considered formidable time, stronger than anything else, which creates and annihilates everything. To whom shall I leave all of my wealth and fortune? I am becoming older and older. What shall I do? Shall I execute devotional service from here at home? This I cannot do, because my mind is being attracted by the transcendental land of Vṛndāvana."

This is an instance of hopelessness, pride, doubt, patience, lamentation, determination and eagerness—an aggregation of seven different symptoms in ecstatic love for Kṛṣṇa.
There is a proverb in Sanskrit which says, "Disappointment gives rise to the greatest satisfaction." In other words, when one's sentiment or ambition becomes too great and is not fulfilled until after seemingly hopeless tribulation, that is taken as the greatest satisfaction. Once the cowherd boys in Vṛndāvana were vainly searching after Kṛṣṇa for a long time, and for that reason their faces became blackened, and their complexions appeared faded. Just then they could hear on the hill a faint vibration from Kṛṣṇa's flute. Immediately all of them became very much gladdened. This is an instance of satisfaction in the midst of disappointment.
(Nectar of Devotion).