"Most observers today would agree that, at a minimum, the fundamental features of a democracy include government based on majority rule and the consent of the governed, the existence of free and fair elections, the protection of minorities and respect for basic human rights. Democracy presupposes equality before the law, due process and political pluralism."

The Economist 

“… This nation, under God, shall have a new birth of freedom—and that government of the people, by the people, for the people, shall not perish from the earth.”

Abraham Lincoln

“In the democracy which I have envisaged, a democracy established by non-violence, there will be equal freedom for all. Everybody will be his own master. It is to join a struggle for such democracy that I invite you today.”

Gandhi

"Many forms of Government have been tried, and will be tried in this world of sin and woe. No one pretends that democracy is perfect or all-wise. Indeed, it has been said that democracy is the worst form of Government except all those other forms that have been tried from time to time; but there is the broad feeling in our country that the people should rule, continuously rule, and that public opinion, expressed by all constitutional means, should shape, guide, and control the actions of Ministers who are their servants and not their masters." 
 

Winston Churchill

"Democracy is based on the majority principle. This is especially true in a country such as ours where the vast majority have been systematically denied their rights. At the same time, democracy also requires that the rights of political and other minorities be safeguarded. In the political order we have established there will regular, open and free elections, at all levels of government - central, provincial and municipal."

Nelson Mandela

"The will of the people shall be the basis of the authority of government, as expressed by exercise of the right and civic duties of citizens to choose their representatives through regular, free and fair elections with universal and equal suffrage, open to multiple parties, conducted by secret ballot, monitored by independent electoral authorities, and free of fraud and intimidation."
 

Warsaw Declaration of the Community of Democracies

"Democracy cannot succeed unless those who express their choice are prepared to choose wisely. The real safeguard of democracy, therefore, is education. It has been well said that no system of government gives so much to the individual or exacts so much as a democracy. Upon our educational system must largely depend the perpetuity of those institutions upon which our freedom and our security rest. To prepare each citizen to choose wisely and to enable him to choose freely are paramount functions of the schools in a democracy."
 

Franklin D. Roosevelt