Question

which figure of speech is used in this text? common sense is not so common. —attributed to voltaire paradox hyperbole

Explanation:

A paradox is a statement that seems contradictory but may reveal a truth. The phrase "Common sense is not so common" presents a seeming contradiction (common sense being not common) which fits the definition of a paradox. Hyperbole is an exaggeration, and this statement does not exaggerate but rather presents a contradictory idea.

Answer:

paradox