na hy asyarthah sura-ganaih
nodvegas cagunasya hi
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Lord Visnu Himself, the Supreme Personality of Godhead, is the reservoir of all pleasure. Therefore, what benefit would He derive from siding with the demigods? What interest would He fulfill in this way? Since the Lord is transcendental, why should He fear the asuras, and how could He be envious of them?
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
We should always remember the distinction between spiritual and material. That which is material is infected by material qualities, but these qualities cannot touch that which is spiritual, or transcendental. Krsna is absolute, whether He is in the material world or spiritual world. When we see partiality in Krsna, this vision is due to His external energy. Otherwise how could His enemies attain salvation after being killed by Him? Everyone who deals with the Supreme Personality of Godhead gradually acquires the qualities of the Lord. The more one advances in spiritual consciousness, the less he is affected by the duality of material qualities. The Supreme Lord, therefore, must certainly be freed from these qualities. His enmity and friendship are external features presented by the material energy. He is always transcendental. He is absolute, whether He kills or bestows His favor.
Envy and friendship arise in one who is imperfect. We fear our enemies because in the material world we are always in need of help. The Lord, however, does not need anyone’s help, for He is atmarama. The Lord says in Bhagavad-gita (9.26):
patram puspam phalam toyam
yo me bhaktya prayacchati
tad aham bhakty-upahrtam
“If a devotee offers Me with devotion a little leaf, a flower, fruit or water, I shall accept it.” Why does the Lord say this? Is He dependent on the offering of the devotee? He is not actually dependent, but He likes to be dependent upon His devotee. This is His mercy. Similarly, He does not fear the asuras. Thus there is no question of partiality in the Supreme Personality of Godhead.