Shrimad Bhagavad Gita As It Is -Shri Shrimad A.C Bhaktivedanta Swami Prabhupada
Nature, the Enjoyer, and Consciousness
Chapter 13: Verse-19
iti ksetram tathä jnänam jneyam coktam samäsatah
Thus the field of activities [the body], knowledge and the knowable have been summarily described by Me. Only My devotees can understand this thoroughly and thus attain to My nature.
The Lord has described in summary the body, knowledge and the knowable. This knowledge is of three things: the knower, the knowable and the process of knowing. Combined, these are called vijnäna, or the science of knowledge. Perfect knowledge can be understood by the unalloyed devotees of the Lord directly. Others are unable to understand. The monists say that at the ultimate stage these three items become one, but the devotees do not accept this. Knowledge and development of knowledge mean understanding oneself in Krsna consciousness. We are being led by material consciousness, but as soon as we transfer all consciousness to Krsna’s activities and realize that krsna is everything, then we attain real knowledge. In other words, knowledge is nothing but the preliminary stage of understanding devotional service perfectly. In the Fifteenth Chapter this will be very clearly explained. Now, to summarize, one may understand that  and beginning from mahä-bhütäni and continuing through cetanä dhrtih, analyze the material elements and certain manifestations of the symptoms of life. These combine to form the body, or the field of activities. And verses through from amänitvam through tattva-jnänärtha-darsanam, describe the process of knowledge for understanding both types of knower of the field of activities, namely the soul and the Supersoul. through beginning from anädi mat-param and continuing through hrdi sarvasya visthitam, describe the soul and the Supreme Lord, or the Supersoul.
Thus three items have been described: the field of activity , the process of understanding, and both the soul and the Supersoul. It is especially described here that only the unalloyed devotees of the Lord can understand these three items clearly. So for these devotees Bhagavad-gita is fully useful; it is they who can attain the supreme goal, the nature of the Supreme Lord, Krsna. In other words, only devotees, and not others, can understand Bhagavad-gita and derive the desired result.
- iti=thus; ksetram=the field of activities (the body); tathä=also;
jnänam=knowledge; jneyam=the knowable; ca=also; uktam=described; samäsatah=in summary; mat-bhaktah=My devotee; etat=all this; vijnäya=after understanding; mat-bhäväya=to My nature; upapadyate=attains.
- verses 6
- Then verses 13
- the body