Kṛṣṇa answers Arjuna’s questions concisely. First, He defines ‘Brahman’ as the indestructible, transcendental living entity. This refers to the spirit soul. Second, He defines ‘Adhyātma’ as the eternal nature of the soul. The soul’s natural state is to be a conscious servant of the Divine. Third, He defines ‘Karma’ as the action pertaining to the development of the material bodies of living entities. Karma is the ‘visargaḥ’, the specific force of action that triggers the creation of a physical body. We act according to our desires, and those actions force nature to provide us with a body that matches our mentality. This is a scientific definition of reincarnation. We are eternal spirit (Brahman) with an eternal nature (Adhyātma), but our material activities (Karma) generate the physical frames we occupy. By understanding this, Arjuna can see that he is a spiritual being temporarily acting within a material system driven by past deeds.