Man is not man, but a wolf to those he does not know.
There's no such thing, you know, as picking out the best woman: it's only a question of comparative badness, brother.
It is well for one to know more than he says
Know not what you know, and see not what you see. [Lat., Etiam illud quod scies nesciveris; Ne videris quod videris.]
Know this, that troubles come swifter than the things we desire.
The evil that we know is best.
It is best to know the worst at once.
That which you know, know not; and that which you see, see not.