A person who is very envious, proud, easily angered, restless and complacent is called dhīroddhata by learned scholars. Such qualities were visible in the character of Lord Kṛṣṇa, because when He was writing a letter to Kālayavana, Kṛṣṇa addressed him as a sinful frog. In His letter Kṛṣṇa advised Kālayavana that he should immediately go and find some dark well for his residence, because there was a black snake named Kṛṣṇa who was very eager to devour all such sinful frogs. Kṛṣṇa reminded Kālayavana that He could turn all the universes to ashes simply by looking at them.
The above statement by Kṛṣṇa seems apparently to be of an envious nature, but according to different pastimes, places and times this quality is accepted as a great characteristic. Kṛṣṇa's dhīroddhata qualities have been accepted as great because Kṛṣṇa uses them only to protect His devotees. In other words, even undesirable traits may also be used in the exchange of devotional service.