It is also said that a person who goes to the temple of the Lord and worships with great devotion, but who does not show sympathy to people in general or show respect to other devotees, is considered to be a third-class devotee. The second-class devotee is he who is merciful and compassionate to the fallen soul. The second-class devotee is always cognizant of his position as an eternal servant of the Lord; he therefore makes friendships with devotees of the Lord, acts compassionately toward the general public in teaching them devotional service, and refuses to cooperate or associate with nondevotees. As long as one is not compassionate to people in general in his devotional service to the Lord, he is a third-class devotee. The first-class devotee gives assurance to every living being that there is no fear of this material existence: "Let us live in Kṛṣṇa consciousness and conquer the nescience of material existence."
(Srimad Bhagavatam---3:21:31---purport).

Materialistic persons are engaged in striving for temporary benefits, whereas persons advanced in spiritual knowledge, such as Prahlāda Mahārāja, are not interested in the materialistic way of life. Instead, they want to be elevated to an eternal life of knowledge and bliss. Therefore, as Kṛṣṇa is always compassionate to the fallen souls, His servants, the devotees of Lord Kṛṣṇa, are also interested in educating the entire populace in Kṛṣṇa consciousness. The mistake of materialistic life is understood by devotees, and therefore they smile upon it, considering it insignificant. Out of compassion, however, such devotees preach the gospel of Bhagavad-gītā all over the world.
(Srimad Bhagavatam---7:5:55---purport).

To be obedient to the wishes of the Supreme Lord is the natural position of every living entity. But due only to past misdeeds, a living being becomes averse to the sense of subordination to the Lord and suffers all the miseries of material existence. No one has anything to do but render devotional service to the Supreme Lord, Śrī Kṛṣṇa. Therefore any activity other than transcendental loving service to the Lord is more or less a rebellious action against the supreme will. All fruitive activity, empirical philosophy and mysticism are more or less against the sense of subordination to the Lord, and any living entity engaged in such rebellious activity is more or less condemned by the laws of material nature, which work under the subordination of the Lord. Great unalloyed devotees of the Lord are compassionate towards the fallen, and therefore they travel all over the world with the mission of bringing souls back to Godhead, back to home. Such pure devotees of the Lord carry the message of Godhead in order to deliver the fallen souls, and therefore the common man who is bewildered by the influence of the external energy of the Lord should avail himself of their association.
(Srimad Bhagavatam---3:5:3---purport).

Prahlāda Mahārāja is the topmost example of a Vaiṣṇava, who is always compassionate toward sinful persons suffering a hellish life within this material world. Kṛṣṇa is therefore known as para-duḥkha-duḥkhī kṛpāmbudhiḥ, or one who is compassionate toward others' suffering and who is an ocean of mercy. Like Prahlāda Mahārāja, all pure devotees of the Lord come to this material world with full compassion to deliver the sinful. They undergo all kinds of tribulations, suffering them with tolerance, because that is another qualification of a Vaiṣṇava, who tries to deliver all sinful persons from the hellish conditions of material existence. Vaiṣṇavas are therefore offered the following prayer:
vāñchā-kalpatarubhyaś ca
kṛpā-sindhubhya eva ca
patitānāṁ pāvanebhyo
vaiṣṇavebhyo namo namaḥ
(I offer my respectful obeisances unto all the Vaiṣṇava devotees of the Lord. They can fulfill the desires of everyone, just like desire trees, and they are full of compassion for the fallen souls.)
The chief concern of a Vaiṣṇava is to deliver the fallen souls.
(Srimad Bhagavatam---4:21:47---purport).