The only indispensable material factor in the generation of power is the living together of people. Only where men live so close together that the potentialities of action are always present can power remain with them, and the foundation of cities, which as city-states have remained paradigmatic for all Western political organization, is therefore indeed the most important material prerequisite for power. What keeps people together after the fleeting moment of action has passed (what we today call "organization") and what, at the same time, they keep alive through remaining together is power. And whoever, for whatever reasons, isolates himself and does not partake in such being together, forfeits power and becomes impotent, no matter how great his strength and how valid his reasons.
Hannah Arendt, The Human Condition, 1958