A Fortiori Argument
The Latin phrase argumentum a fortiori denotes "argument 'from stronger '." For example, if it has been established that a person is deceased, then one can, with equal or greater certainty, argue that the person is not breathing.
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“A striking feature of moral and political argument in the modern world is the extent to which it is innovators, radicals, and revolutionaries who revive old doctrines, while their conservative and reactionary opponents are the inventors of new ones.”
—Alasdair Chalmers MacIntyre (b. 1929)