In Hindu cosmology, Satya Yuga is an age of divine order, moral certainty, and social harmony, where freedom is limited because people are expected to live according to fixed rules, duties, and virtues, with little space for moral deviation.
Kali Yuga is an age of spiritual decline, moral complexity, materialism, and hedonism, where traditional rules and authority are weaker and individuals have greater freedom to choose between virtue, vice, restraint, and personal desire.