Maturity: The Responsibility of Being Oneself Book by Osho

In "Maturity: The Responsibility of Being Oneself," Osho distinguishes between the simple physical process of "growing old" and the spiritual evolution of "growing up". Published in 1999, the book argues that true maturity is not a result of age or worldly experience, but a spiritual rebirth characterized by reclaiming the innocence and wonder of childhood through conscious awareness.