Certainly, the citizen casts his vote. But to vote is not to mandate someone to represent one's interests. What is declared as the main aim of this institution is for the elected representatives of the people to reach decisions according to criteria of the public good. But they demand sovereign power to take decisions, and one cannot trust a sovereign. An ultimate power to decide generates its own norms. In this case a trust can at most refer to an awareness of the limits on sovereignty.

Niklas Luhmann, Trust and Power, loc. 222