The Great Epic of the Bhārata dynasty 6.35.6

6.35.6

icchā dveṣaḥ sukhaṃ duḥkhaṃ saṃghātaścetanā dhṛtiḥ |
etatkṣetraṃ samāsena savikāramudāhṛtam || 6 ||

"The Holy One said, 'This body, O son of Kunti, is called Kshetra. Him who knoweth it, the learned call Kshetrajna. Know me, O Bharata, to be Kshetras. The knowledge of Kshetra and Kshetrajna I regard to be (true) knowledge. What that Kshetra (is), and what (it is) like, and what changes it undergoes, and whence (it comes), what is he (viz., Kshetrajna), and what his powers are, hear from me in brief. All this hath in many ways been sung separately, by Rishis in various verses, in well-settled texts fraught with reason and giving indications of Brahman. The great elements, egoism, intellect, the unmanifest (viz., Prakriti), also the ten senses, the one (manas), the five objects of sense, desire, aversion, pleasure, pain, body consciousness, courage,--all this in brief hath been declared to be Kshetra in its modified form.