Bg 8.1

arjuna uvaca
kim tad brahma kim adhyatmam
kim karma purusottama
adhibhutam ca kim proktam
adhidaivam kim ucyate

Word for word: 
arjunah uvaca — Arjuna said; kim — what; tat — that; brahma — Brahman; kim — what; adhyatmam — the self; kim — what; karma — fruitive activities; purusa-uttama — O Supreme Person; adhibhutam — the material manifestation; ca — and; kim — what; proktam — is called; adhidaivam — the demigods; kim — what; ucyate — is called.

Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Arjuna inquired: O my Lord, O Supreme Person, what is Brahman? What is the self? What are fruitive activities? What is this material manifestation? And what are the demigods? Please explain this to me.

Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
In this chapter Lord Krishna answers different questions from Arjuna, beginning with “What is Brahman?” The Lord also explains karma (fruitive activities), devotional service and yoga principles, and devotional service in its pure form. The Srimad-Bhagavatam explains that the Supreme Absolute Truth is known as Brahman, Paramatma and Bhagavan. In addition, the living entity, the individual soul, is also called Brahman. Arjuna also inquires about atma, which refers to body, soul and mind. According to the Vedic dictionary, atma refers to the mind, soul, body and senses also.

Arjuna has addressed the Supreme Lord as Purusottama, Supreme Person, which means that he was putting these questions not simply to a friend but to the Supreme Person, knowing Him to be the supreme authority able to give definitive answers.