Any person who observes regulative principles and fulfills his promises by practical activity is called determined. As far as the Lord's determination is concerned, there is an example in His dealings in the Hari-vaṁśa. This is in connection with Lord Kṛṣṇa's fighting the King of heaven, Indra, who was forcibly deprived of the pārijāta flower. Pārijāta is a kind of lotus flower grown on the heavenly planets. Once, Satyabhāmā, one of Kṛṣṇa's queens, wanted that lotus flower, and Kṛṣṇa promised to deliver it; but Indra refused to part with his pārijāta flower. Therefore there was a great fight, with Kṛṣṇa and the Pāṇḍavas on one side and all of the demigods on the other. Ultimately, Kṛṣṇa defeated all of them and took the pārijāta flower, which He presented to His queen. So, in regard to that occurrence, Kṛṣṇa told Nārada Muni, "My dear great sage of the demigods, now you can declare to the devotees in general, and to the nondevotees in particular, that in this matter of taking the pārijāta flower, all the demigods—the Gandharvas, the Nāgas, the demon Rākṣasas, the Yakṣas, the Pannagas—tried to defeat Me, but none could make Me break My promise to My queen."
There is another promise by Kṛṣṇa in Bhagavad-gītā to the effect that His devotee will never be vanquished. So a sincere devotee who is always engaged in the transcendental loving service of the Lord should know for certain that Kṛṣṇa will never break His promise. He will always protect His devotees in every circumstance.
Kṛṣṇa showed how He fulfills His promise by delivering the pārijāta flower to Satyabhāmā, by saving Draupadī from being insulted and by freeing Arjuna from the attacks of all enemies.