Atman is the central concept in Indian philosophy of mind. It refers to the true self or the essential nature of an individual.

The Upanishads teach that Atman and Brahman are identical. This means that the true self is not separate from the ultimate reality.

The three main characteristics of Atman are Sat (existence), Chit (consciousness), and Ananda (bliss).

Atman is different from the body. The body is a physical entity, while Atman is a spiritual entity.

Atman is different from the world. The world is a physical entity, while Atman is a spiritual entity.

The goal of spiritual practice in Indian philosophy is to attain liberation from the cycle of rebirth, achieve union with Brahman, and realize the true nature of Atman.

The Brihadaranyaka Upanishad is considered to be the most important text on the concept of Atman.

Adi Shankara is considered to be the father of Advaita Vedanta, a school of thought that emphasizes the non-duality of Atman and Brahman.

The concept of 'neti neti' in relation to Atman means 'not this, not this'. It is a method of negation used to describe Atman, as it is beyond words and concepts.

The concept of 'tat tvam asi' in relation to Atman means 'you are that'. It is a statement of identity between Atman and Brahman, and a call to realize the true nature of Atman.

Asat (non-existence) is not a characteristic of Atman. Atman is characterized by Sat (existence), Chit (consciousness), and Ananda (bliss).

Atman is different from the ego. The ego is a limited and changing aspect of the self, while Atman is the true and unchanging self.

Atman is different from the mind. The mind is a limited and changing aspect of the self, while Atman is the true and unchanging self.

Atman is different from the intellect. The intellect is a limited and changing aspect of the self, while Atman is the true and unchanging self.

Atman is different from the senses. The senses are limited and changing aspects of the self, while Atman is the true and unchanging self.