A pure devotee is always free from any kind of material desires. In the material world, one's material desires are all most demonic; one thinks of others as one's enemies, one thinks of revenge against one's enemies, one aspires to become the topmost leader or topmost person in this material world, and thus one competes with all others.
(Srimad Bhagavatam-----4:9:29-----purport).

When a sādhu chastises or punishes someone, he does not do so for revenge.
(Srimad Bhagavatam-----10:10:19-----purport).

The devotee of the Lord does not retaliate against the wrongdoer, but the Lord does not tolerate any mischief done to the devotee by the miscreants. The Lord can excuse a person on His own account, but He excuses no one who has done harm to His devotees.
(Bhagavad-Gita-----1:32-35-----purport).

Generally a materialistic person becomes very happy when there is something for his sense gratification and his body, but when he sees that others have something for their sense gratification and he hasn't, he is sorry and envious. When he is expecting some retaliation from an enemy, he is in a state of fear, and when he cannot successfully execute something he becomes dejected.
(Bhagavad-Gita-----12:15-----purport).

A devotee engaged in chanting the holy name of the Lord should practice forbearance like that of a tree. Even if rebuked or chastised, he should not say anything to others to retaliate.
(Sri Caitanya Caritamrta-----1:17:27-----translation).

One who approaches the Supreme Lord to render devotional service, but who is proud of his personality, envious of others or vengeful, is in the mode of anger. He thinks that he is the best devotee. Devotional service executed in this way is not pure; it is mixed and is of the lowest grade, tāmasaḥ. Śrīla Viśvanātha Cakravartī Ṭhākura advises that a Vaiṣṇava who is not of good character should be avoided. A Vaiṣṇava is one who has taken the Supreme Personality of Godhead as the ultimate goal of life, but if one is not pure and still has motives, then he is not a Vaiṣṇava of the first order of good character. One may offer his respects to such a Vaiṣṇava because he has accepted the Supreme Lord as the ultimate goal of life, but one should not keep company with a Vaiṣṇava who is in the mode of ignorance.
(Srimad Bhagavatam-----3:29:8-----purport).

According to Vedic civilization, domestic animals and servants are treated exactly like one's own children. Animals and children are sometimes punished not out of vengeance but out of love. Similarly, a master sometimes punishes his servant, not out of vengeance but out of love, to correct him and bring him to the right point. Thus King Purañjana took his punishment dealt by his wife, the Queen, as mercy upon him. He considered himself the most obedient servant of the Queen. She was angry at him for his sinful activities—namely, hunting in the forest and leaving her at home. King Purañjana accepted the punishment as actual love and affection from his wife. In the same way, when a person is punished by the laws of nature, by the will of God, he should not be disturbed. A real devotee thinks in this way. When a devotee is put into an awkward position, he takes it as the mercy of the Supreme Lord.
(Srimad Bhagavatam-----4:26:21-----purport).