He who knows nothing doubts nothing.
What you don’t know doesn’t hurt you.
You don’t know what may happen before evening.
Good is good, but better beats it. The person who enjoys good health is rich, even if he doesn’t know it.
Don’t celebrate someone’s departing unless you know who will succeed him.
Who knows most believes least.
The enemy you know is better than the one you do not know.
You will never know until you try.
There is more to knowing than just being correct.
A knife does not know who is its master.
Better know rightly than hope wrongly.
No one can know for certain.
One can never know too much.
The less you know, the less you forget.