The quote expresses a desire to move on from past experiences by symbolically closing the door on them. It suggests that it's time to leave behind what's been concluded, almost as if finalizing a chapter in a book. This notion emphasizes the importance of letting go to make space for new beginnings.
By referencing the act of reading a book, the quote implies that life is a continuous journey made of different chapters. Each chapter brings new lessons and experiences, which allow individuals to evolve and grow. Embracing the future with a fresh perspective is essential for personal development.