In plain words
Pāṇḍavāścaiva means that which is pure; that is, the good and the bad have both gathered: what are they doing? The good is doing good. The bad is doing bad. 'What are the good and the bad doing, gathered together?' asked none other than Dhṛtarāṣṭra, the blind man. Tell Me, what Ajñāna it is to ask what the good and the bad, both gathered together, are doing! If we go to the play ground to play and someone asks, 'What are you doing?', they say, 'We are playing.' To go to the battlefield and ask, 'What are they doing?': how senseless that is! They are fighting. In this body, which is Kurukṣetra, the Pāṇḍavas and Kauravas, who are the good and the bad, are at war.
So we must drive away this bad, and to win victory over the bad we must give this good the help and strength it needs. The good are the Pāṇḍavas. The wicked are the Kauravas. How did these Pāṇḍavas become good? They took refuge in Kṛṣṇa; by taking refuge in God, they were transformed into Pāṇḍavas. They kept God before them. But the Kauravas were different: 1st, Ahaṅkāra itself, next the world; they went to Kṛṣṇa and asked for His army. Because they put God Last, they became Lost. So every man must keep God before him. When he keeps God before him, his whole life turns into victory. That is why,
dharmakṣētrē kurukṣētrē samavētā yuyutsavaḥ māmakāpāṇḍavaścaiva kimakurvata sañjaya:
to this question, what answer does Sañjaya give?
yatra yōgēśvaraḥ kṛṣṇaḥ yatra pārthō dhanurdharaḥ tatra śrīḥ vijayō bhūtiḥ dhruvā nītirmati rmama
'Where God is, where the life-force full of courage and daring is, there alone victory comes,' he said. There must be firm faith in God. That faith must not waver this way or that at all. It must stay steady. Only to such a one does such victory come. So whatever work we do, whatever we resolve upon, we must enter into this work with faith in God.