This body is called the ksetra, and within it dwells the owner of the body and the Supreme Lord who knows both the body and the owner of the body. Therefore He is called the knower of all fields. The distinction between the field of activities, the owner of activities and the supreme owner of activities is described as follows. Perfect knowledge of the constitution of the body, the constitution of the individual soul, and the constitution of the Supersoul is known in terms of Vedic literature as jnanam. That is the opinion of Krsna. To understand both the soul and the Supersoul as one yet distinct is knowledge. One who does not understand the field of activity and the knower of activity is not in perfect knowledge. One has to understand the position of prakrti, nature, and purusa, the enjoyer of the nature, and isvara, the knower who dominates or controls nature and the individual soul. One should not confuse the three in their different capacities. One should not confuse the painter, the painting and the easel. This material world, which is the field of activities, is nature, and the enjoyer of nature is the living entity, and above them both is the supreme controller, the Personality of Godhead. It is stated in the Vedic language: "bhokta bhogyam preritaram ca matva sarvam proktam tri-vidham brahmam etat." There are three Brahman conceptions: prakrti is Brahman as the field of activities, and the jiva (individual soul) is also Brahman and is trying to control material nature, and the controller of both of them is also Brahman, but He is the factual controller.