12
Śrīmad-Bhāgavatam
[Canto 7, Ch. 1]
tamasy etāni jāyante vivṛddhe kuru-nandana
“The manifestations of the modes of goodness can be experienced when all the gates of the body are illumined by knowledge.
“O chief of the Bhāratas, when there is an increase in the mode of passion, the symptoms of great attachment, uncontrollable desire, hankering, and intense endeavor develop.
“O son of Kuru, when there is an increase in the mode of ignorance, madness, illusion, inertia and darkness are manifested.”
The Supreme Personality of Godhead, who is present in everyone’s heart, simply gives the results of the increase in the various qualities, but He is impartial. He supervises victory and loss, but He does not take part in them.
The various modes of material nature do not work all at once. The interactions of these modes are exactly like seasonal changes. Sometimes there is an increment of  rajo-guṇa , sometimes of  tamo-guṇa  and sometimes  sattva-guṇa . Generally the demigods are surcharged with  sattva-guṇa , and therefore when the demons and the demigods fight, the demigods are victorious because of the prominence of their  sattva-guṇa  qualities. However, this is not the partiality of the Supreme Lord.
TEXT 9
ज्योतिरादिरिवाभाति सङ्घातान्न विविच्यते । विदन्त्यात्मानमात्मस्थं मथित्वा कवयोऽन्ततः॥९॥
jyotir-ādir ivābhāti saṅghātān na vivicyate vidanty ātmānam ātma-stham mathitvā kavayo 'ntataḥ
jyotiḥ—fire; ādiḥ—and other elements; iva—just as; ābhāti—appear; saṅghātāt—from the bodies of demigods and others; na—not; vivicyate—are distinguished; vidanti—perceive; ātmānam—the Supersoul; ātma-stham—situated in the heart; mathitvā—by discerning; kavayaḥ—expert thinkers; antataḥ—within.