Hatreds not vowed and concealed are to be feared more than those openly declared.
Marcus Tullius Cicero
No one respects a talent that is concealed.
Desiderius Erasmus
Congealed fat is pretty much the same, irrespective of the delicacy around which it is concealed.
Clement Freud
If you want to keep something concealed from your enemy, don't disclose it to your friend.
Solomon Ibn Gabirol
The secrets of slavery are concealed like those of the Inquisition.
Harriet Ann Jacobs
One crime has to be concealed by another.
Lucius Annaeus Seneca
Not all things are to be discovered; many are better concealed.
Sophocles