This document discusses theories of how language and personal identity interact and develop. It explores how a sense of self emerges from early childhood as physical, linguistic, social and cognitive skills develop. Language plays a vital role in shaping self-identity and how people interact. Theories discussed include behaviorism, which sees identity and language arising from observation and imitation, and innatism/nativism, which posit humans are born with abilities and ideas that enable language acquisition. The development of language and self is influenced by social and family relationships throughout life.