Treaty on European Union (consolidated version)
Article 6

1. The Union is founded on the principles of liberty, democracy, respect for human rights and fundamental freedoms, and the rule of law, principles which are common to the Member States.
2. The Union shall respect fundamental rights, as guaranteed by the European Convention for the Protection of Human Rights and Fundamental Freedoms signed in Rome on 4 November 1950 and as they result from the constitutional traditions common to the Member States, as general principles of Community law.
3. The Union shall respect the national identities of its Member States.
4. The Union shall provide itself with the means necessary to attain its objectives and carry through its policies.