One sees the advent of religious sacrifices i.e. Yagyas in the Treta yuga. One pillar of the four pillars of religion meets its end. The colour of Bhagwan Achyut becomes red. People in this era will be truthful and would perform all the religious ceremonies according to the sacrifices. It is the Treta yuga where one can see the overtures of Yagyas, religion and allied activities. People would beget desired fruits by performing actions, donations mentioned in the Vedas and by taking resolutions.
All people in this era were assiduous and active. The main religion of Brahmins was truth that is truthful speech, good conduct and love towards all creatures. The common religion of all the Brahmins was Yagya, self-study and donation. The primary aim of Shudras was service towards Brahmins, Kshatriyas and Vaishyas. The duties of Kshatriyas and Vaishyas were the protection of people and agriculture, trade and poultry respectively. All people would sincerely adhere to their respective duties and as a result they would be blessed with celestial bliss.
The average life expectancy of a human in the Treta yuga was approximately 3000 years. All the Kshatriyas born in this era were valiant, zealous, big thinkers, pious, truthful, beautiful, suitable to be blessed, revered and the protectors of all people. The Vedas, religious sacrifices and Varnashram were adhered to very strictly in the Satyayuga and the Treta yuga.
There are only two pillars left of religion in the Dwapar yuga. Here Bhagwan Vishnu assumes yellow colour. Here the Vedas are categorized into four parts that is Rik, Sama, Yajur and Atharvaveda. During those times the Brahmins were knowledgeable of two, some of three and some others have studied all the four Vedas thoroughly. Accordingly because of this categorization, even different actions and activities came into existence.
People were engaged only in penance and charity. They were kingly and pleasure seeking. In this era, the divine intellect ceased to exist, hence seldom anyone would be truthful. Consequently people were plagued by ailments, diseases and various types of desires. After suffering from these ailments people would perform penance. Some would also organize Yagya for material benefits as well as for divinity.
In this era, the Brahmins were involved in Yagya, self-study, donation and teaching activities. The duties of Kshatriyas were protection of subjects and the duty of Vaishyas was trade, poultry and agriculture. The duty of Shudras was to serve all these three classes.
The Kshatriyas in this era were humble and performed their duties by controlling their senses. The king would avail to the advice of the learned scholars and accordingly would maintain law and order in his empire. The king who was addicted to vices would definitely end up defeated. One or two or all from Sama, Dama, Danda, Bhed and Upeksha would be brought into use and would attain the desired. Kings were diligent in maintaining public decorum and order.
Kings would plan many a conspiracy surreptitiously along with the scholars. Strong people would execute work where execution of policies was involved.The king would appoint priests etc to perform religious activities, economists and ministers to perform monetary activities, impotents to take carte of women and cruel men to execute heinous activities.
Brahmins would attain celestial bliss by engaging in penance, religion, control of senses, restraint, Yagya etc. Vaishya would attain higher planes through charity and hospitality.The Kshatriyas would honestly execute all policies of law and order without being angry, cruel and being devoid of greed and consequently attained bliss.The average life expectancy of humans in Dwapar was 2000 years. All people in this era were zealous, valiant, courageous and competitive by nature.
One sees that the life expectancy began to fall in this era because of neglect of Varnashram, Vedas and Yagyas. Vedas became inactivated during the Dwapar and Kali yuga. At the end of Kali yuga somewhere they shall be seen and some places they shall be seen and some places they shall not be seen.