“For although in a certain sense and for light-minded persons non-existent things can be more easily and irresponsibly represented in words than existing things, for the serious and conscientious historian it is just the reverse.”

Motto of the work written by Hesse, and attributed to an "Albertus Secundus"
The Glass Bead Game (1943)
Context: For although in a certain sense and for light-minded persons non-existent things can be more easily and irresponsibly represented in words than existing things, for the serious and conscientious historian it is just the reverse. Nothing is harder, yet nothing is more necessary, than to speak of certain things whose existence is neither demonstrable nor probable. The very fact that serious and conscientious men treat them as existing things brings them a step closer to existence and to the possibility of being born.

Annotated Drawings by Eugene J. Martin: 1977-1978

Heretics (1905)

1900s, Love Among the Artists (1900)

Source: A Season in Hell/The Drunken Boat

5th Public Talk, Amsterdam, The Netherlands (30 May 1967)
1960s

Dieu existe? Oui http://books.google.com.mx/books/about/Dieu_existe_Oui.html?id=TBUCHQAACAAJ&redir_esc=y (1979). Paris. Stock. Christian Chabanis, p. 94.
Original: L’ordre naturel n’est pas une invention de l’esprit humain et une mise en place de certaines propriétés d’observation... Qui dit ordre dit intelligence organisatrice. Cette intelligence ne peut être que celle de Dieu.

This statement is not to be found in the works of Herodotus. It appears in the acknowledgements to Mark Twain's A Horse's Tale (1907) preceded by the words "Herodotus says", but Twain was simply summarizing what he took to be Herodotus' attitude to historiography.
Misattributed