The Upanishads, a collection of ancient Sanskrit texts, explore the nature of reality and the self. The concept of Atman, the individual soul or self, is central to their teachings.

Advaita Vedanta, a school of Hindu philosophy, posits that the ultimate reality is Brahman, an all-pervasive, infinite consciousness. It emphasizes the non-duality of Atman (individual self) and Brahman.

Anatta, a core teaching in Buddhism, asserts that there is no permanent, unchanging self or soul. It emphasizes the impermanence and interconnectedness of all phenomena.

Jainism posits the existence of Jiva, an individual soul or self. Jiva is believed to be a pure, conscious entity that is distinct from the material world and strives for liberation from karmic bondage.

According to Nyaya, the self is a substance that undergoes change and is capable of experiencing pleasure, pain, and other mental states. It is distinct from the body and the mind.

Moksha, or liberation, is a central concept in Indian philosophy. It refers to the ultimate goal of breaking free from the cycle of rebirth and attaining spiritual enlightenment or self-realization.

Adi Shankara, a prominent Advaita Vedanta philosopher, proposed the theory of the five sheaths of the self (Pancha Koshas). These sheaths represent different layers of the self, from the physical body to the innermost essence.

The Bhagavad Gita explores the nature of the self through various yogic paths, including Karma Yoga (action), Bhakti Yoga (devotion), Jnana Yoga (knowledge), and Raja Yoga (meditation).

Maya, an important concept in Advaita Vedanta, refers to the illusion or veil of ignorance that obscures the true nature of reality. It is often contrasted with the concept of the self, which is the true, unchanging essence.

Kapila, the founder of Samkhya philosophy, proposed the theory of the three gunas (qualities): sattva (purity), rajas (activity), and tamas (inertia). These gunas are believed to influence the nature and behavior of the self.

Self-inquiry, or atma-vichara, is a central practice in Advaita Vedanta and other Indian philosophical traditions. It involves turning the mind inward to investigate the nature of the self and its relationship with reality.

The Mandukya Upanishad presents the theory of the four states of consciousness: waking, dreaming, deep sleep, and turiya (the fourth state). These states are believed to correspond to different levels of reality and the nature of the self.

The concept of the self in Indian philosophy is intricately connected to the ideas of Samsara (the cycle of rebirth), Karma (action and its consequences), Dharma (righteousness and duty), and Moksha (liberation from the cycle of rebirth).

Buddha, the founder of Buddhism, taught the eightfold path as a means to attain enlightenment and liberation from suffering. The eightfold path consists of right understanding, right thought, right speech, right action, right livelihood, right effort, right mindfulness, and right concentration.

Self-realization, or atma-darshan, is a central goal in many Indian philosophical traditions. It involves the direct experience and understanding of the true nature of the self, leading to liberation and spiritual fulfillment.