The thirteenth chapter of the Bhagavad Gita is Ksetra Ksetrajna Vibhaaga Yoga. The word kshetra means the field, and the kshetrajna means the knower of the field. We can think of our material body as the field and our immortal soul as the knower of the field. In this chapter, Krishna discriminates between the physical body and the immortal soul. He explains that the physical body is temporary and perishable whereas the soul is permanent and eternal. The physical body can be destroyed but the soul can never be destroyed. The chapter then describes God, who is the Supreme Soul. All the individual souls have originated from the Supreme Soul. One who clearly understands the difference between the body, the Soul and the Supreme Soul attains the realization of Brahman.
Desire, repulsion, happiness, sorrow, the aggregate (of body and organs), sentience, fortitude- this field, together with its modifications, has been spoken of briefly.OPEN VERSE
Humility, unpretentiousness, non-injury, for-bearance, sincerity, service of the teacher, cleanliness, steadiness, control of body and organs;OPEN VERSE
Non-attachment with regard to objects of the senses, and also absence of egotism; seeing the evil in birth, death, old age, diseases and miseries;OPEN VERSE
Non-attachment and absence of fondness with regard to sons, wives, homes, etc., and constant equanimity of the mind with regard to the attainment of the desirable and the undesirable;OPEN VERSE
And unwavering devotion to Me with single-minded concentration; inclination to repair into a clean place; lack of delight in a crowd of people;OPEN VERSE
Steadfastness in the knowledge of the Self, contemplation on the Goal of the knowledge of Reality-this is spoken of as Knowledge. Ignorance is that which is other than this.OPEN VERSE