Though all that has arrived, by report, of our knowledge of times past should be true, and known by some one person, it would be less than nothing in comparison of what is unknown. And of this same image of the world, which glides away whilst we live upon it, how wretched and limited is the knowledge of the most curious; not only of particular events, which fortune often renders exemplary and of great concern, but of the state of great governments and nations, a hundred more escape us than ever come to our knowledge.

Montaigne