While performing activity, as said above, the result achieved depends on the knowledge. Development of knowledge is the duty of brahmanas. Due to God-centered system, the Aryan society especially valued development of the spiritual knowledge as it is the basis for a person’s release from vice. Vicious persons cannot connect with the Lord. The Lord is the absolute purity and He does not contact with anything impure. The Aryan society was based on the Vedas which are composed of different parts discussing various material problems and specifying godly ways of their solution. The main idea is that all living beings depend on the Lord and have to satisfy Him or His representative to solve arising problems.
In the Bhagavad-Gita, Krishna says (Chapter 3, verses 10 and 15):
In the beginning of creation, the Lord of all creatures sent forth generations of men and demigods, along with sacrifices for Visnu, and blessed them by saying, "Be thou happy by this yajna (sacrifice) because its performance will bestow upon you a life of ease and, eventually, liberation.
Regulated activities are prescribed in the Vedas, and the Vedas are directly manifested from the Supreme Personality of Godhead. Consequently the all-pervading Transcendence is eternally situated in acts of sacrifice.
To satisfy the Lord, it is required to make sacrifices and for these sacrifices to be accepted pure persons are needed. These pure persons are brahmanas. The condition of society was dependent on their qualifications. Where qualified brahmanas live, God Himself lives. Brahmanas have got different qualifications. The simplest brahmanas were those who studied the karma-kanda section of the Vedas, lived a pure life and made sacrifices for fulfillment of material desires by religious methods. They were responsible for material prosperity of society and the minimal spiritual development.
Sacrifices were the axis of the activity of the Aryan society. Here the subject for a serious discussion is raised. In fact, the Vedic literature is full of descriptions of sacrifices; for a modern man their process and especially the results are unclear and unreliable. So, there is the need for the answer on the most important question: what was God-centeredness of the Aryan society based on? The answer on this question hides the difference between pseudo-religious and the Aryan societies. The Aryan literature is full of descriptions of meetings with the Supreme Personality of Godhead. No any other ancient and even more modern literature contains detailed descriptions of the personality of Godhead, the demigods and other personalities coming to us from different planets. It seems so impossible that modern scientists declare such descriptions fiction or revaluation of really existing “lesser mortals” who had displayed some incredible capabilities and therefore were worshiped on the same basis as gods. On the one hand, the Vedic literature includes very serious knowledge and till now its secrets have remained inaccessible to modern scientists, philosophers and ordinary people. On the other hand, incredible events, from our view point, are described there. Such contradiction makes the Vedas something unclear for people with secular mind habits.