Darkness is said to have activity for its essence. It is the cause of successive deeds. When it predominates, its mark, among all beings, is production,
प्रकृत्यात्मकमेवाहू रजः पर्यायकारकम्। प्रवृत्तं सर्वभूतेषु दृश्यमुत्पत्तिलक्षणम्॥