The heroes of history are so decked out by the fine fancy of the professed historian; they talk in such measured prose, and act from such sublime or such diabolical motives, that few have sufficient taste, wickedness, or heroism, to sympathise in their fate. Besides, there is much uncertainty even in the best authenticated ancient or modern histories; and that love of truth, which in some minds is innate and immutable, necessarily leads to a love of secret memoirs and private anecdotes.
We cannot judge either of the feelings or of the characters of men with perfect accuracy, from their actions or their appearance in public; it is from their careless conversations, their half-finished sentences, that we may hope with the greatest probability of success to discover their real character.
— Maria Edgeworth, author’s preface to Castle Rackrent, 1800 (paragraph break added for clarity)
Blue Book Diaries 