It's better to stay silent and look a fool, rather than speak and remove all doubt.

Hain't we got all the fools in town on our side? And hain't that a big enough majority in any town?

It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.

Fools are not Foolish.

The conviction of the rich that the poor are happier is no more foolish than the conviction of the poor that the rich are

When in doubt tell the truth.