Isocrates Panathenaicus 164

[164] The principle is not of my invention but is deduced from the conduct of our ancestors. For when they saw that the other states were beset by many misfortunes and wars and seditions, while their own city alone was well governed, they did not take the view that those who were wiser and more fortunate than the rest of the world were justified in caring nothing about the others or in permitting those states which shared the same stock ¹ with them to be destroyed, but rather that they were bound to take thought and adopt measures to deliver them all from their present misfortunes.