Removes the statement that matches the input text.
        Removes any responses from statements if the response text matches the
        input text.

def remove(self, statement_text):
        """
        Removes the statement that matches the input text.
        Removes any responses from statements if the response text matches the
        input text.
        """
        Statement = self.get_model('statement')

        statements = Statement.objects.filter(text=statement_text)

        statements.delete()