Physical body is a field and God dwell in it in form of consciousness. This omni present form of divine illuminitates all inner & outer spheres of life Universally. Thirteenth chapter inspires to experience the same.

(The Yoga of Differentiation of The Field And Its Knower)

Srimad Bhagvad Gita is a sacred scripture which is supremely liberal, impartial, beneficial for all. Every aspect connected with self-upliftment can be found in this scripture. Any seeker with any bent of mind desiring to adopt any of the paths for upliftment, this scripture in the same spirit presents to the seeker the path of spiritual upliftment in a simple, easily comprehensible and graspable manner.

Arjun had expressed his desire to know at the commencement of the twelfth chapter as to who is superior between the devotees of God with form and attributes and that of the formless God with no attributes. The Blessed Lord stated that it is difficult to practise the worship of the formless divine without attributes for those who have egoism attached to the body. Presenting the worship of the divine with form and attributes in a simple manner, the Lord has motivated the embodied being to strive for attaining Him. The devotees endowed with the attributes of devotion are found to be dear to Him and those who are keen to imbibe the nectar of the attributes of righteousness with reverence and faith by calling them to be extremely dear the twelfth chapter comes to a close. The Gita preacher has given a one-sided verdict. Is this so that the devotion of the Lord without form and attributes is not possible at all?

Pre-empting this probability the matchless declarer of the Gita, the world teacher, Lord Shri Krishna without any further query from Arjun begins the thirteenth chapter by Himself.