9.10. 10. Of the Weakness of neighbouring States.
Whensoever a state lies contiguous to another that happens to be in
its decline, the former ought to take particular care not to precipitate
the ruin of the latter, because this is the happiest situation
imaginable; nothing being so convenient as for one prince to be near
another, who receives for him all the rebuffs and insults of fortune.
And it seldom happens that by subduing such a state the real power of
the conqueror is as much increased as the relative is diminished.