How does the amendment process reflect the idea of democracy?

One can say that democracy is the ability of the citizens to govern themselves as they see fit rather than just accept the dictates of a king. The Constitution left a way open for subsequent generations to change their government as they saw fit when the time comes. If the Constitution had no way of being amended, the generations of citizens coming after the adoption of the Constitution would have to accept living under a system they had no part in creating. Without the ability to change their government, the citizens might just as well be living under the rule of a king with no say in how their government should work.