The document discusses how three factors - heredity, environment, and the self - shape a person's identity. Heredity refers to the genetic inheritance one receives at conception that provides potentials for development. The environment, including physical and socio-cultural influences, determines how those genetic potentials are realized. The self is one's awareness, consciousness, and sense of identity, which incorporates how one sees themselves, how others see them, and one's true self that is difficult to fully know. Understanding the interplay between these three factors can provide insight into human identity and development.