The negative is the best and most impressive method of enforcing the value of the positive.

A negative may be fact, but can not be known except by the knowledge of its opposite.

Negativing that possibility was the cold statement of the disinterested young girl that Barker had been there before, and, too, the fact that Barker was leaving from the front door instead of through the servant's door.

Negativing that possibility was the cold statement of the disinterested young girl that Barker had been there before, and, too, the fact that Barker was leaving from the front door instead of through the servant's door.