History is, in its essentials, the science of change. It knows and it teaches that it is impossible to find two events that are ever exactly alike, because the conditions from which they spring are never identical.
Marc BlochBut history is neither watchmaking nor cabinet construction. It is an endeavor toward better understanding.
Marc BlochThe historian is, by definition, absolutely incapable of observing the facts which he examines.
Marc BlochThenceforth they thought that, rationally concluded, doubt could become an instrument of knowledge.
Marc Bloch