Not sure? Here are some proverbs and quotes about doubt.

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A belief which leaves no place for doubt is not a belief; it is a superstition.
José BergamínBetter to remain silent and be thought a fool than to speak and to remove all doubt.
Abraham LincolnDeep doubts, deep wisdom; small doubts, little wisdom.
He who knows nothing, doubts nothing.
I can't criticize what I don't understand. If you want to call this art, you've got the benefit of all my doubts.
Charles RosinIgnorance more frequently begets confidence than does knowledge.
Charles DarwinSource: The Descent of Man
It is better to keep your mouth shut and appear stupid than to open it and remove all doubt.
Percy Bysshe ShelleyNever doubt that you can change history. You already have.
Marge PiercyThe believer is happy; the doubter is wise.
The biggest cause of trouble in the world today is that the stupid people are so sure about things and the intelligent folks are so full of doubts.
Bertrand RussellThe problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence.
Charles BukowskiThe trouble with the world is that the stupid are cocksure and the intelligent are full of doubt.
Bertrand RussellThere are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know.
Donald RumsfeldWaiting is painful. Forgetting is painful. But not knowing which to do is the worse kind of suffering.
Paulo CoelhoWhen you find yourself on the side of the majority, it is time to pause and reflect.
Mark TwainYou aren't sure if you're making the right decision - about anything, ever.
Joan Didion