"You were never more mistaken in your life," replied Peter, with anything but legal guardedness concerning unprovable statements. [Please select]
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This answer, too, seems to entail an unprovable assumption which should not be made without explicit evidence. [Please select]
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The man who is prepared to exclude even this one theory of the Universe from the category of possible but unprovable theories is not, properly speaking, an Agnostic. [Please select]
Do you have a better example in your mind? Please submit your sentence!