This article advocates for a thick concept of rule of law, which refers to the idea that rule of law has both material and formal content. The controversial part seems to be the question of material content and whether it obscures the essential meaning of the rule of law as a requirement of legality. However, the material aspect of rule of law can be linked to the value-base of the European Union. For example, during its EU Presidency, Finland has strongly emphasized the significance of the value base and rule of law in Article 2 TEU for the development of the EU. Democracy, rule of law and human rights are connected together into a trinity where all the components form preconditions for the others.Oikeusvaltio-käsitteen analyysi EU-oikeude...