I know that I am what I am. But I am not sure what I am.
Genius knows where the questions are hidden.
Generosity knows how to count, but refrains.
The critical spirit never knows when to stop meddling.
Nobody knows the trouble I've seen: even less, the trouble I've successfully avoided.
I know that I am very much like everybody else, but not really.
Do as you like--if you know what it is.
Listen to what people say about themselves; they will tell you everything you need to know.
Photography knows how to authenticate its misrepresentations.
Folly always knows the answer.
Jealousy is inconsolable because it cannot know the beloved
Experience teaches us, but we scarcely know what.
I did not know I was in my prime until afterwards.
When I get the point, I often don't know what to do with it.