"What a wee little part of a person's life are his acts and his words! His real life is led in his head, and is known to none but himself…His acts and his words are merely the visible thin crust of his world…and they are so trifling a part of his bulk! A mere skin enveloping it. The mass of him is hidden–it and it's volcanic fires that toss and boil, and never rest, night nor day.
These are his life, and they are not written, and cannot be written…Biographies are but the clothes and buttons of the man–the biography of the man himself cannot be written."
Excerpt from Autobiography of Mark Twain, Vol. 1, by Mark Twain