Paragraph 2 makes it possible for future enactment of a constitutional act that would introduce some institutions of direct democracy, namely via referendum. The Cabinet's draft of the Constitution did not contain such a provision, as the Civic Democratic Party and the Civic Democratic Alliance were opposed to referendums. In the end, it did find its way into the Constitution with support from some social democratic deputies, and at the insistence of Václav Havel. Although several drafts of a constitutional act on referendum had been prepared since the enactment of the Constitution, the only nationwide referendum conducted so far was the referendum on the accession of the Czech Republic to the European Union. Paragraphs 3 and 4 embody the principle of enumerated powers and the silence of law principle. The principle of enumerated powers requires that the power of the state can only be applied in such cases, within such boundaries, and by such means, as is stipulated by law. The silence of law principle, in contrast, states that everyone may do everything law does not prohibit, and is not required to do anything, unless it is imposed on him by law. This provision is similar to article 2 of the Charter. Where the constitution talks of ""every citizen"", the Charter widens its to ""everyone"".