The international relations theories of realism and neorealism, sometimes called "realpolitik" advise politicians to explicitly ban absolute moral and ethical considerations from international politics, and to focus on self-interest, political survival, and power politics, which they hold to be more accurate in explaining a world they view as explicitly amoral and dangerous. Political realists usually justify their perspectives by stating that morals and politics should be separated as two unrelated things, as exerting authority often involves doing something not moral. Machiavelli wrote: "there will be traits considered good that, if followed, will lead to ruin, while other traits, considered vices which if practiced achieve security and well being for the prince."