"Critical thinking

 is possible only where the standpoints of all others are open to inspection. Hence, critical thinking, while still a solitary business, does not cut itself off from ‘all others.’ To be sure, it still goes on in isolation, but by the force of imagination it makes the others present and thus moves in a space that is potentially public, open to all sides; in other words, it adopts the position of Kant’s world citizen. To think with an enlarged mentality means that one trains one’s imagination to go visiting."

-- Hannah Arendt, Lectures on Kant's Political Philosophy