Here are some not so common Latin phrases and sentences which were used a lot during the Roman Empire and after you read them you will no doubt see why we ought to revive many if not most of these ones:
1. Auribus Teneo Lupem (I hold a wolf by the ears). This sentence may seem odd, but it is really very similar to another phrase which I am sure that you know: "Holding a tiger by the tail". The former sentence is taken from Terence in his work Phormio (c. 161 BCE). It was a common Ancient Roman Proverb denoting that it is equally risky doing something as it is doing nothing!