“Youth! There is nothing like youth. The middle-aged are mortgaged to Life. The old are in Life's lumber-room. But youth is the Lord of Life. Youth has a kingdom waiting for it. Every one is born a king, and most people die in exile.”
The idea behind the quotation
Youth is presented as a time of freedom and possibility; as people grow older, responsibilities and experience can estrange them from the promise they were born to enjoy.