The Prince by Niccolo Machiavelli Chapter 3 Page 12

difficulties but also future, against which they must use all diligence to provide; for these, if they be foreseen while yet remote, admit of easy remedy, but if their approach be awaited, are already past cure, the disorder having become hopeless; realizing what the physicians tell us of hectic fever, that in its beginning it is easy to cure, but hard to recognize; whereas, after a time, not having been detected and treated at the first, it becomes easy to recognize but impossible to cure.

And so it is with State affairs. For the distempers of a State being discovered while yet inchoate, which can only be done by a sagacious ruler, may easily be dealt with; but when, from not being observed, they are suffered to grow until they are obvious to every one, there is no longer any remedy. The Romans, therefore, foreseeing