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

Diogenes' quote talks to the idea of a global citizenship, or the concept that a person's identity is not restricted to a single nation or culture. This concept is especially appropriate today, as the world ends up being progressively interconnected and individuals are more likely to move and reside in different nations. Diogenes' quote suggests that a person's identity should not be limited to a single country or culture, but rather need to include the entire world. He is suggesting that we should all make every effort to be citizens of the world, rather than residents of a single nation. This idea is particularly essential in today's world, as it motivates us to be open-minded and tolerant of various cultures and beliefs. It also motivates us to believe beyond our own national borders and to acknowledge the interconnectedness of the world. Diogenes' quote is a reminder that we are all residents of the world, and that we need to make every effort to be unbiased and tolerant of various cultures and beliefs.