Could you please elaborate on the purport and quote below, especially on how all of these qualities, especially envy, can be properly used for the Lord or His devotee? Usually we hear that envy cannot be engaged but given up.

"Srila Narottama dasa Thakura has sung in his Prema-Bhakti-candrika, 'krodha' bhakta-dvesi jane: anger should be used to punish a demon who is envious of devotees. Kama, krodha, lobha, moha, mada and matsarya—lust, anger, greed, illusion, pride and envy—all have their proper use for the Supreme Personality of Godhead and His devotee."

Ref. VedaBase => SB 7.9.1

Krodha bhakta-dvesi-jane [Prema-bhakti-candrika]. That is Narottama Thakura's instruction. You must be very angry, those who are against God and devotee. Very angry. Utilize your anger for them. Krodha bhakta-dvesi-jane. That anger is service. Krsna-seba kamarpane. For Krsna's service one should be mad. Kama-krodha should be given up, but a bhakta does not give up. Utilize it. A bhakta should be very much kamuk for serving Krsna. And he must utilize his anger for the bhakta-dvesi, those who are not devotee. Kama krsna-kamarpane krodha bhakta-dvesi-jane [Prema-bhakti-candrika]. We have nothing to give up like Mayavadi — kama, krodha, lobha, moha, matsarya. Matsarya may… That has to be… A bhakta cannot be envious. If a bhakta is angry upon them, that is not envious; that is for good. A bhakta should not be envious. Otherwise how he can preach? He's merciful. Even if he's angry, it is mercy. Therefore this matsarya has no use for bhakta. Other things, they have use: kama, krodha, lobha, moha. Not matsarya. Matsarya is very bad.

>>> Ref. VedaBase => Room Conversation — February 16, 1977, Mayapur