It is the mark of an educated mind to be able to entertain a thought without accepting it.
I often will quote and reference the teachings of Aristotle (384-322 BCE). This philosopher, trained by Plato has set substantial impact onto the world of thinking and upon me from his Nicomachean Ethics or Aristotelian Ethics.
Aristotle does not regard politics as a separate science from ethics, but as the completion, and almost a verification of it. The moral ideal in political administration is only a different aspect of that which also applies to individual happiness. Humans are by nature social beings, and the possession of rational speech (logos) in itself leads us to social union. The state is a development from the family through the village community, an offshoot of the family. Formed originally for the satisfaction of natural wants, it exists afterwards for moral ends and for the promotion of the higher life. The state in fact is no mere local union for the prevention of wrong doing, and the convenience of exchange. It is also no mere institution for the protection of goods and property. It is a genuine moral organization for advancing the development of humans.
You can read Aristotle’s book, Nicomachean Ethics online.
I would also highly recommend The Republic by Plato.