Compare and contrast:
"What you have said in the dark will be heard in the daylight, and what you have whispered in the ear in the inner rooms will be proclaimed from the roofs."
"Do not revile the king even in your thoughts,
or curse the rich in your bedroom,
because a bird in the sky may carry your words,
and a bird on the wing may report what you say."
Let us hope we are tending toward more of the former, and less of the latter!
(Citations courtesy of Rob on Contrary Brin. Thanks!)