Keep no secrets of thyself from thyself.
More Greek Proverbs:
You must keep quiet or say only things that improve silence.Greek
A lazy tailor finds his thread too long.
Greek
A thousand people cannot undress a naked person.
Greek
If you steal something small you are a petty thief, but if you steal millions you are a gentleman of society.
Greek
Mountains are used to snow.
Greek
Nothing will content him who is not content with a little.
Greek