Maharaja Pariksit had inquired why Narada Muni was subject to a spirit of revenge (tamah). But this was not tamah, for Narada Muni, in full knowledge of what was for the good of the 2 brothers (Nalakuvara & Manigriva), wisely thought of how to cure them

Expressions researched:
"Mahārāja Parīkṣit had inquired why Nārada Muni was subject to such a spirit of revenge (tamaḥ). But this was not tamaḥ, for Nārada Muni, in full knowledge of what was for the good of the two brothers, wisely thought of how to cure them"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

When a sādhu chastises or punishes someone, he does not do so for revenge. Mahārāja Parīkṣit had inquired why Nārada Muni was subject to such a spirit of revenge (tamaḥ). But this was not tamaḥ, for Nārada Muni, in full knowledge of what was for the good of the two brothers, wisely thought of how to cure them. Vaiṣṇavas are good physicians.

SB 10.10.19, Translation and Purport

Therefore, since these two persons, drunk with the liquor named Vāruṇī, or Mādhvī, and unable to control their senses, have been blinded by the pride of celestial opulence and have become attached to women, I shall relieve them of their false prestige.

When a sādhu chastises or punishes someone, he does not do so for revenge. Mahārāja Parīkṣit had inquired why Nārada Muni was subject to such a spirit of revenge (tamaḥ). But this was not tamaḥ, for Nārada Muni, in full knowledge of what was for the good of the two brothers, wisely thought of how to cure them. Vaiṣṇavas are good physicians. They know how to protect a person from material disease. Thus they are never in tamo-guṇa. Sa guṇān samatītyaitān brahma-bhūyāya kalpate (BG 14.26). Vaiṣṇavas are always situated on the transcendental platform, the Brahman platform. They cannot be subject to mistakes or the influence of the modes of material nature. Whatever they do, after full consideration, is meant just to lead everyone back home, back to Godhead.