Introduction -- The Search for the Common Good: Beyond the Normative and the Natural: -- From normative theory to diagnostic practice -- The failure of political naturalism -- The historization of politics -- The time is coming when we will have to relearn about politics -- Three Diagnostic Thinkers in Pursuit of the Common Good: Carl Schmitt: 'all essential concepts are not normative but existential -- Hannah Arendt: 'does politics still have a meaning? -- Michel Foucault: 'could you define the sense you give the word 'political'?' -- The Fragility of the Common Good: -- A fundamental change in political paradigms -- Politics as a domain of uncertainty Incluye referencias bibliográficas