Just as a human life has four phases: childhood, youth, maturity and old age, every organisation or system goes through four phases: Krita, Treta, Dvapara and Kali. It is said that the bull of dharma stands on four legs in the Krita yuga, on three legs in Treta yuga, two in Dvapara yuga and one in Kali yuga. After this, the bull of dharma and the society it upholds is washed away by the waters of Pralaya. This is death of the world, followed by rebirth. In the new life, the four yugas will follow each other once again. This is the kala-chakra, or the circle of time.
