To keep a secret is a divine law.
A secret is a trust, and to betray it is perfidy.
The least of all noble traits is to keep a secret, and the greatest is to forget it.
He controls himself most who hides a secret from his friends.
When a secret is known to more than two, it becomes public.
He who seeks a place to hide his secret reveals it.
Walls have ears.
It is unwise to confide a secret to two tongues and four ears.
Your secret is your captive, betray it and you become its captive.
A man should be a tomb in which a secret is deposited.
If you keep your secret you are safe, and it will be to your sorrow if you reveal it.
Hearts are the depositaries of secrets, lips their locks, and tongues their keys.
The hearts of the wise are the fortresses of secrets.