Srimad Bhagavadgita Sadhaka Sanjivani -Swami Ramsukhdas
Thus with the words—Om, Tat, Sat, the names of the Lord, in the Upanisad of the Bhagavadgita, the knowledge of Brahma, the Supreme, the scripture of Yoga and the dialogue between Sri Krsna and Arjuna, this is eighth designated discourse: "The Yoga of the Imperishable Brahma."
The terms 'Aksara' (Imperishable), and 'Brahma, stand for God Who is attributeless-formless; with attributes-formless; and endowed with, attributes and form. The thought of anyone of the three kinds, leads a striver to, union with God. Therefore this chapter is designated:"The Yoga of the Imperishable Brahma."
Out of the twenty-eight verses, of this chapter, in the ninth, tenth and eleventh verses, there is 'upajati' metre; in the twenty-eighth verse there is 'indravajra', metre. Out of the remaining twenty-four verses, in the third quarter of the second verse, and first quarter of the fourteenth verse, 'bha-gana' being used there, is 'bha-vipula' metre; in the third quarter of the twenty-fourth verse, 'ma-gana' being used there, is 'mavipula' metre; in the first quarter of the twenty-seventh verse 'ra-gapa' being used there is, 'ra-vipuia' metre; and in the first quarter and the third quarter of the third verse 'na-gana' being used there, is 'jatipaksa-vipula' metre- The remaining nineteen verses are possessed of the characteristics of right, 'pathyavaktra' Anustup metre.