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Եին բանակի հանրապետություն
[Ch. 13.
kṣetram ity abhidhīyate etad yo vetti taṁ prāhuḥ kṣetrajñah iti tad-vidah
arjunah   uvāca —Arjuna said;  prakṛtim —nature;  puruṣam —the enjoyer;  ca —also;  eva —certainly;  kṣetram —body;  kṣetrajñam —knower of the body;  eva —certainly;  ca —also;  etat —all this;  veditum —to understand;  icchāmi —I wish;  jñānam —knowledge;  jñeyam —the object of knowledge;  ca —also;  keśava —O Kṛṣṇa;  śrī bhagavān   uvāca —the Personality of Godhead said;  idam —this;  śarīram —body;  kaunteya —O son of Kuntī;  kṣetram —the field;  iti —thus;  abhidhīyate —is called;  etat —this;  yaḥ —anyone;  vetti —knows;  tam —him;  prāhuḥ —is called;  kṣetrajñaḥ —knower of the body;  iti —thus;  tat-vidaḥ —one who knows.
TRANSLATION
Arjuna said: O my dear Kṛṣṇa, I wish to know about prakṛti [nature], Puruṣa [the enjoyer], and the field and the knower of the field, and of knowledge and the end of knowledge. The Blessed Lord then said: This body, O son of Kuntī, is called the field, and one who knows this body is called the knower of the field.
PURPORT
Arjuna was inquisitive about  prakṛti , or nature,  puruṣa , the enjoyer,  kṣetra , the field,  kṣetrajña , its knower, and of knowledge and the object of knowledge. When he inquired about all these, Kṛṣṇa said that this body is called the field and that one who knows this body is called the knower of the field. This body is the field of activity for the conditioned soul. The conditioned soul is entrapped in material existence, and he attempts to lord over material nature. And so, according to his capacity to dominate material nature, he gets a field of activity. That field of activity is the body. And what is the body? The body is made of senses. The conditioned soul wants to enjoy sense gratification, and, according to his capacity to enjoy sense gratification, he is offered a body, or field of activity. Therefore the body is called  kṣetra , or the field of activity for the conditioned soul. Now, the person who identifies himself with the body is called  kṣetrajña , the knower of the field. It is not very difficult to understand the difference between the field and its knower, the body and the knower of the body. Any person can consider that from childhood to old age he