Anatta
In Buddhism, the term anattā (Pāli) or anātman (Sanskrit: अनात्मन्) refers to the notion of "not-self" or the illusion of "self". In the early texts, the Buddha commonly uses the word in the context of teaching that all things perceived by the senses (including the mental sense) are not really "I" or "mine", and for this reason one should not cling to them.
In the same vein, the Pali suttas (and parallel āgamas, both referred to collectively below as the nikāyas), categorize the phenomena experienced by a being into five groups ("khandhas") that serve as the objects of clinging and as the basis for a sense of self. In the Nikāyas, the Buddha repeatedly emphasizes not only that the five khandhas of living beings are "not-self", i.e. not "I" or "mine", but also that clinging to them as if they were "I" or "mine" gives rise to unhappiness.
According to the early texts, while on the path, one should develop oneself in healthy and liberating ways, only letting go of the attempt to improve the self as it becomes unnecessary.
Read more about Anatta: Overview, Anatta in The Nikayas, Anatta and Moral Responsibility, Developing The Self, Buddhism and The Self of The Upanishads, Nibbana and Anatta, Anatta in The Tathagatagarbha Sutras, Teaching of Self in The 'Chanting The Names of Mañjusri', Anatman in Advaita Vedanta, Relationship To Secular Philosophy, Anatta in Contemporary Philosophy, Wu-Wo Tea Ceremony