Be quiet vs keep quiet


Is there difference between be and keep below?

a sign saying “Please Be Quiet.”
a sign saying “Please Keep Quiet.”

Which is more common or natural? Both sound same to me.

Thank you in advance,

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In some cases the words are interchangeable. In other cases be is the better choice. I can’t think of any cases where keep is better. So if you always use be then you are safe.

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