Real democracy establishes limits to popular will. Not everything is permitted under a constitution, even if the people will it. Democracy is designed at its core to be spiritually empty. The defining proposition of liberal democracy is that it mandates means (through elections, parliaments and markets) but not ends.
Democracy is a charming form of government, full of variety and disorder, and dispensing a sort of equality to equals and unequals alike. It passes into despotism.
Man's capacity for justice makes democracy possible, but man's inclination to injustice makes democracy necessary.