The frequently expressed view that written constitutions are inherently more liberal than unwritten ones is false. No written constitution is more than a paper with words on it until those words are both interpreted and applied. Properly understood, then, a constitution is the sum of those procedures through which the power of constitution only when it is interpreted and applied in a liberal way.
What this question is testing
Conclusion
The author is saying: a written constitution is not liberal just because of its words. It only becomes liberal when those words are interpreted and applied in a liberal way.
Evidence
A written constitution is, until interpreted and applied, just words on paper. The real constitution lives in how power is actually exercised and limited.
Evaluate
If liberal interpretation is required for the constitution to be liberal, then reading the text by itself cannot tell you whether a constitution is liberal. You would also need to know how it gets used.
Goal
Find the answer that says, in effect: you cannot determine that a written constitution is liberal just by reading the text.
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