Joseph Campbell: Becoming mature
You become mature when you become the authority of your own life.
Joseph John Campbell (March 26, 1904 - October 30, 1987) was an American mythologist, writer and lecturer, best known for his work in comparative mythology and comparative religion and gave many lectures until short before his death. His work is vast, covering many aspects of the human experience. His philosophy is often summarized by his phrase: "Follow your bliss."