The disc of the Lord is called Sudarsana because he does not discriminate between high and low criminals or demons. Durvasa Muni was certainly a powerful brahmana, but his acts against the pure devotee Maharaja Ambarisa were no better than the activities of asuras. As stated in the sastras, dharmam tu saksad bhagavat-pranitam: [SB 6.3.19] the word dharma refers to the orders or laws given by the Supreme Personality of Godhead. Sarva-dharman parityajya mam ekam saranam vraja: [Bg. 18.66] real dharma is surrender unto the Supreme Personality of Godhead. Therefore real dharma means bhakti, or devotional service to the Lord. The Sudarsana cakra is here addressed as dharma-setave, the protector of dharma. Maharaja Ambarisa was a truly religious person, and consequently for his protection the Sudarsana cakra was ready to punish even such a strict brahmana as Durvasa Muni because he had acted like a demon. There are demons even in the form of brahmanas. Therefore the Sudarsana cakra does not discriminate between brahmana demons and sudra demons. Anyone against the Supreme Personality of Godhead and His devotees is called a demon. In the sastras we find many brahmanas and ksatriyas who acted as demons and have been described as demons. According to the verdict of the sastras, one has to be understood according to his symptoms. If one is born of a brahmana father but his symptoms are demoniac, he is regarded as a demon. The Sudarsana cakra is always concerned with annihilating the demons. Therefore he is described as adharma-silasura-dhuma-ketave. Those who are not devotees are called adharma-sila. The Sudarsana cakra is just like an inauspicious comet for all such demons.