The constitution must be open to be amended but only when the majority agrees.
Step-by-step explanation:
The constitution is in many ways a living document.
A constitutions written in the 18th century may have the same core values as the nation right now but its laws either don't hold up or there are certain areas that are left ambiguous and have become glaring in the modern society.
At this point it is important to rule them out and to make new laws for the new life of the new native people of the nation.
But this must only be done when one is certain that the nation is ready for reform and it is begin done with their will.