Ruler of Chedi endued with exceeding prowess, desirous of combating with Vasudeva addressed him and said,--O Janarddana, I challenge thee. Come, fight with me until I slay thee today with all the Pandavas. For, O Krishna, the sons of Pandu also, who disregarding the claims of all p. 88
these kings, have worshipped thee who art no king, deserve to be slain by me along with thee. Even this is my opinion, O Krishna, that they who from childishness have worshipped thee, as if thou deservest it, although thou art unworthy of worship, being only a slave and a wretch and no king, deserve to be slain by me.' Having said this, that tiger among kings stood there roaring in anger. And after Sisupala had ceased, Krishna addressing all the kings in the presence of the Pandavas, spoke these words in a soft voice.--'Ye kings, this wicked-minded one, who is the son of a daughter of the Satwata race, is a great enemy of us of the Satwata race; and though we never seek to injure him, he ever seeketh our evil. This wretch of cruel deeds, ye kings, hearing that we had gone to the city of Pragjyotisha, came and burnt Dwaraka, although he is the son of my father's sister. While king Bhoja was sporting on the Raivataka hill, this one fell upon the attendants of that king and slew and led away many of them in chains to his own city. Sinful in all his purpose, this wretch, in order to obstruct the sacrifice of my father, stole the sacrificial horse of the horse-sacrifice that had been let loose under the guard of armed men. Prompted by sinful motives, this one ravished the reluctant wife of the innocent Vabhru (Akrura) on her way from Dwaraka to the country of the Sauviras. This injurer of his maternal uncle, disguising himself in the attire of the king of Karusha, ravished also the innocent Bhadra, the princess of Visala, the intended bride of king Karusha. I have patiently borne all these sorrows for the sake of my father's sister. It is, however, very fortunate that all this hath occurred today in the presence of all the kings. Behold ye all today the hostility this one beareth towards me. And know ye also all that he hath done me at my back. For the excess of that pride in which he hath indulged in the presence of all these monarchs, he deserveth to be slain by me. I am ill able to pardon today the injuries that he hath done me. Desirous of speedy death, this fool had desired Rukmini. But the fool obtained her not, like a Sudra failing to obtain the audition of the Vedas."
Vaisampayana continued,--"Hearing these words of Vasudeva, all the assembled monarchs began to reprove the ruler of Chedi. But the powerful Sisupala, having heard these words, laughed aloud and spoke thus,--'O Krishna, art thou not ashamed in saying in this assembly, especially before all these kings that Rukmini (thy wife) had been coveted by me? O slayer of Madhu, who else is there than thee, who regarding himself a man would say in the midst of respectable men that his wife had been intended for some body else? O Krishna, pardon me if thou pleasest, or pardon me not. But angry or friendly, what canst thou do unto me?'
"And while Sisupala was speaking thus, the exalted slayer of Madhu thought in his mind of the discus that humbleth the pride of the Asuras. And as soon as the discus came into his hands, skilled in speech the illustrious
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one loudly uttered these words,--'Listen ye lords of earth, why this one had hitherto been pardoned by me. As asked by his mother, a hundred offences (of his) were to be pardoned by me. Even this was the boon she had asked, and even this I granted her. That number, ye kings, hath become full. I shall now slay him in your presence, ye monarchs.' Having said this, the chief of the Yadus, that slayer of all foes, in anger, instantly cut off the head of the ruler of Chedi by means of his discus. And the mighty-armed one fell down like a cliff struck with thunder. And, O monarch, the assembled kings then beheld a fierce energy, like unto the sun in the sky, issue out of the body of the king of Chedi, and O king, that energy then adored Krishna, possessed of eyes like lotus leaves and worshipped by all the worlds, and entered his body. And all the kings beholding the energy which entered that mighty-armed chief of men regarded it as wonderful.
) but another form of Gauri (kali) becomes Tamasic. So its just our way of categorization similar to other things that we categorize for easy remembrance. 
