a lie, look as though you believed every word he said. This will give
him courage to go on; he will become more vehement in his assertions,
and in the end betray himself.
Again, if you perceive that a person is trying to conceal something
from you, but with only partial success, look as though you did not
believe him, This opposition on your part will provoke him into
leading out his reserve of truth and bringing the whole force of it to
bear upon your incredulity.