The man and woman were small gods in their own right, for their experience gave birth to things. Among those things were a boy and a girl, two easily forgotten spirits that hold the memories of mortals.
The eternal girl, Chronica, is caretaker of memories which are yet to come and whispers of happiness and hope.
The eternal boy, Lost, devours the memories of mortals, causing them to forget and whispers of sadness and despair.
In your lifetime, the boy and girl will visit you many times. There's no escaping either of them.