A passive and ignorant citizenry will never create a sustainable world.

Every good citizen makes his country's honor his own, and cherishes it not only as precious but as sacred. He is willing to risk his life in its defense and is conscious that he gains protection while he gives it.

Diogenes, when asked from what country he came, replied, "I am a citizen of the world

I am a citizen of the world.

I am a citizen, not of Athens or Greece, but of the world

I am not an Athenian or a Greek, but a citizen of the world."

[As quoted in Plutarch's Of Banishment]