Mbh 14.39.1a

"'"'Brahma said, "The qualities are incapable of being declared as completely separate from one another. Passion and Goodness and Darkness are seen existing in a state of union. They are attached to one another. They depend on one another. They have one another for their refuge. They likewise follow one another. As long as goodness exists, so long does Passion exist. There is no doubt in this. As long as Darkness and Goodness exist, so long does Passion exist. They make their journey together, in union, and moving collectively. They, verily, move in body, when they act with cause or without cause. Of all these which act with one another, however, much they may differ in their development, the manner in which their increase and diminution take place will now be declared. There where Darkness exists in an increased measure, in the lower creatures (for example), Passion exists in a smaller measure and Goodness in a measure that is still less. There where Passion exists in a copious measure, in creatures of middle course, Darkness exists in a smaller measure and Goodness in a measure that is still less. There where Goodness exists in a copious measure, in creatures of upward courses, Darkness should be known to exist in a small measure and Passion in a measure that is still less. Goodness is the spring that causes the modifications of the senses. It is the great enlightener. No duty has been laid down that is higher than Goodness. They who abide in Goodness proceed upwards. They who abide in Passion remain in the middle. They who abide in Darkness, being characterised by qualities that are low, sink downwards. Darkness occurs in the Sudra; Passion in the Kshatriya; and Goodness, which is the highest, in the Brahmana. The three qualities exist even thus in the three orders. Even from a distance, the three qualities of darkness and Goodness and Passion, are seen to exist in a state of union and more collectively. They are never seen in a state of separation.