(k)no(w) (k)no(w) ...

“I would have every man write about what he knows, and no more than he knows, not only in this but on all other subjects. For a man may have some particular knowledge or experience of the nature of a river or a fountain, who otherwise knows no more than what everybody knows. Yet he will undertake, in order to circulate this little scrap of knowledge, to write a book on the whole science of physics. From this fault spring many great abuses.”

(Michel de Montaigne, “Of Cannibals.”)