What a blessing it would be if we could open and shut our ears as easily as we open and shut our mouths

Keep your mouth shut and your ears open.

I shut up and keep my ears and eyes open.

The most dangerous of all falsehoods is a slightly distorted truth.

The highest level than can be reached by a mediocre but experienced mind is a talent for uncovering the weaknesses of those greater than itself.

When a book and a head collide and a hollow sound is heard, must it always have come from the book?