As paredes tem ouvidos. (Portuguese: The walls have ears.)
The walls have ears, better think before you throw that shoe.
The walls have ears, ears that hear each little sound you make every time you stamp, throw a lamp.
It is notorious that we speak no more than half-truths in our ordinary conversation, and even a soliloquy is likely to be affected by the apprehension that walls have ears.
I grew up in a country where I remember my parents not being able to have a conversation on the phone. The walls had ears, and you couldn't speak freely.
Walls have tongues, and hedges ears.
Walls have ears.Doors have eyes.Trees have voices.Beasts tell lies.Beware the rain.Beware the snow.Beware the manYou think you know.-Songs of Sapphique
I don't make music for eyes. I make music for ears.
It is never too late to be what you might have been
Walls don't fall without effort.