Ethical thought consists of the systematic examination of the relations of human beings to each other, the conceptions, interests and ideals from which human ways of treating one another spring, and the systems of value on which such ends of life are based. These beliefs about how life should be lived, what men and women should be and do, are objects of moral enquiry; and when applied to groups and nations, and, indeed, mankind as a whole, are called political philosophy, which is but ethics applied to society.
Isaiah Berlin The Pursuit of the Ideal