Brahm is eternal
One who thinks about his soul
Is spiritual… // 8 //
The 8th Chapter is Aksharbrahma Yog. And so the definition that one who is indestructible, eternal is Brahma. He is omnipresent and we have to learn to find Him. The efforts for finding Him is ‘Karma’.
Also one who thinks about oneself and his own development is spiritual. Thinking about the soul is a difficult task, but one can begin with oneself atleast. The whole chapter deals with such questions and answers them.