As the servant of Zeus should love, caring for his friends, but submitting himself to God. That was why [Diogenes] alone made the whole world his country, and no special land, and when he was made prisoner he did not long for Athens or for his friends and companions there, but made himself at home with the pirates who took him and tried to make them better, and afterwards when he was sold he lived in Corinth just as he lived before in Athens; yes, and if he had gone away to the Perrhaebians it would have been just the same. That is how freedom is achieved. That is why he said, 'Since Antisthenes freed me, I have ceased to be a slave.' How did he free him? Hear what he says: 'He taught me what is mine and what is not mine; property is not mine; kinsfolk, relations, friends, reputation, familiar places, converse with men—none of these is my own.'
Source: The Discourses of Epictetus, tr. by P.E Matheson,