Everyone is eligible for the supreme destination. In the Śrīmad-Bhāgavatam (2.4.18) it is stated that even the lowest, who are called caṇḍālas (dog-eaters), can be purified by association with a pure devotee. Therefore devotional service and the guidance of a pure devotee are so strong that there is no discrimination between the lower and higher classes of men; anyone can take to it. The most simple man taking shelter of the pure devotee can be purified by proper guidance.
(Bhagavad-Gita------9:32-------purport).

The worship of the Supreme Lord will then undoubtedly take place. Lord Caitanya has said that in this age no one needs to change his position, but one should give up the endeavor to understand the Absolute Truth by speculative reasoning. One should learn to become the servant of those who are in knowledge of the Supreme Lord. If one is fortunate enough to takeshelter of a pure devotee, hear from him about self-realization and follow in his footsteps, one will be gradually elevated to the position of a pure devotee.
(Bhagavad-Gita------13:26-------purport).

In Bhagavad-gītā it is said that any person, regardless of birth as śūdra, woman, or merchant, can take shelter of the lotus feet of the Lord and by so doing can return to Godhead. To take shelter of the lotus feet of the Lord means to take shelter of the pure devotees. The pure devotees whose only business is serving are honored by the names Prabhupāda and Viṣṇupāda, which indicate such devotees to be representatives of the lotus feet of the Lord. Anyone, therefore, who takes shelter of the lotus feet of a pure devotee by accepting the pure devotee as his spiritual master can be at once purified. Such devotees of the Lord are honored equally with the Lord because they are engaged in the most confidential service of the Lord, for they deliver out of the material world the fallen souls whom the Lord wants to return home, back to Godhead.
(Srimad Bhagavatam------1:1:15-------purport).

In the Bhagavad-gītā (9.32) it is said by the Lord that there is no bar to becoming a devotee of the Lord (even for those who are lowborn, or women, śūdras or vaiśyas), and by becoming a devotee everyone is eligible to return home, back to Godhead. The only qualification is that one take shelter of a pure devotee of the Lord who has thorough knowledge in the transcendental science of Kṛṣṇa (Bhagavad-gītā and Śrīmad-Bhāgavatam). Anyone from any part of the world who becomes well conversant in the science of Kṛṣṇa becomes a pure devotee and a spiritual master for the general mass of people and may reclaim them by purification of heart.
(Srimad Bhagavatam------2:4:18-------purport).

One should take shelter of a pure devotee, who has nothing to do with this material world but is simply engaged in devotional service. By serving him only, one can transcend the qualitative material condition. In this verse it is recommended (yogeśvara-upāsanayā) that one serve the lotus feet of the topmost yogī, or the devotee. To serve the topmost devotee means to hear from him about the glories of the Supreme Personality of Godhead. To hear the glories of the Supreme Personality of Godhead from the mouth of a pure devotee is to acquire a pious life.
(Srimad Bhagavatam------4:22:22-------purport).

As stated in Caitanya-caritāmṛta (CC.2:22:54):
"sādhu-saṅga", "sādhu-saṅga"—sarva-śāstre kaya
lava-mātra sādhu-saṅge sarva-siddhi haya
It is a fact that if one takes shelter of a pure devotee, one attains all perfection, even if the association is a short one. A sādhu is a pure devotee of the Lord.

(Srimad Bhagavatam------5:13:25-------purport).

The great saint Jaḍa Bharata described both the miserable condition and the means to get out. The only way out of it is association with devotees, and this association is very easy. Although unfortunate people also get this opportunity, due to their great misfortune they cannot take shelter of pure devotees, and consequently they continuously suffer. Nonetheless, this Kṛṣṇa consciousness movement insists that everyone take to this path by adopting the chanting of the Hare Kṛṣṇa mahā-mantra.

(Srimad Bhagavatam------5:14:39-------purport).

Even if one wanders for many millions of years, from the time of creation until the time of annihilation, one cannot get free from the path of material existence unless one receives shelter at the lotus feet of a pure devotee. As a monkey takes shelter of the branch of a banyan tree and thinks he is enjoying, the conditioned soul, not knowing the real interest of his life, takes shelter of the path of karma-kāṇḍa, fruitive activities. Sometimes he is elevated to the heavenly planets by such activities, and sometimes he again descends to earth. This is described by Śrī Caitanya Mahāprabhu as brahmāṇḍa bhramite. However, if by Kṛṣṇa's grace one is fortunate enough to come under the shelter of the guru, by the mercy of Kṛṣṇa he receives lessons on how to execute devotional service to the Supreme Lord.

(Srimad Bhagavatam------5:14:41-------purport).

It is stated here that this confidential knowledge is extremely difficult to understand, yet it is very easy to understand if one takes shelter of a pure devotee. This confidential knowledge is also mentioned at the end of Bhagavad-gītā, where the Lord says, sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja: (B.G:18:66) "Abandon all varieties of religion and just surrender unto Me." This knowledge is an extremely confidential secret, but it can be understood if one approaches the Supreme Personality of Godhead through the bona fide agent, the spiritual master in the disciplic succession from Nārada. Prahlāda Mahārāja wanted to impress upon the sons of the demons that although such knowledge can be understood only by a saintly person like Nārada, they should not be disappointed, for if one takes shelter of Nārada instead of material teachers, this knowledge is possible to understand. Understanding does not depend upon high parentage. The living entity is certainly pure on the spiritual platform, and therefore anyone who attains the spiritual platform by the grace of the spiritual master can also understand this confidential knowledge.

(Srimad Bhagavatam------7:6:27-------purport).

To save oneself, one must take shelter of a pure devotee. Narottama dāsa Ṭhākura therefore says, chāḍiyā vaiṣṇava-sevā nistāra pāyeche kebā. If one wants to save himself from material nature's onslaughts, which arise because of the material body, one must become Kṛṣṇa conscious and try to fully understand Kṛṣṇa. As stated in Bhagavad-gītā (4.9), janma karma ca me divyam evaṁ yo vetti tattvataḥ. One should understand Kṛṣṇa in truth, and this one can do only by serving a pure devotee. Thus Prahlāda Mahārāja prays that Lord Nṛsiṁhadeva place him in touch with a pure devotee and servant instead of awarding him material opulence. Every intelligent man within this material world must follow Prahlāda Mahārāja. Mahājano yena gataḥ sa panthāḥ (CC.2:17:186). Prahlāda Mahārāja did not want to enjoy the estate left by his father; rather, he wanted to become a servant of the servant of the Lord (CC.2:13:80). The illusory human civilization that perpetually endeavors for happiness through material advancement is rejected by Prahlāda Mahārāja and those who strictly follow in his footsteps.
(Srimad Bhagavatam------7:9:24-------purport).