"Value" has no meaning other than in relationship to living beings. The value of a thing is always relative to a particular person, is completely personal and different in quantity for each living human—"market value" is a fiction, merely a rough guess at the average of personal values, all of which must be quantitatively different or trade would be impossible.
Starship Troopers, p.93-94
“It is our choices, Harry, that show what we truly are, far more than our abilities.”
― J.K. Rowling, Harry Potter and the Chamber of Secrets