Stubborn and ardent clinging to one's opinion is the best proof of stupidity.
Obstinacy and dogmatism are the surest signs of stupidity. Is there anything more confident, resolute, disdainful, grave and serious than an ass?
One must be a little foolish if one does not want to be even more stupid.
Stupidity and wisdom meet in the same centre of sentiment and resolution, in the suffering of human accidents.
Nobody is exempt from saying stupid things, the harm is to do it presumptuously.
A little folly is desirable in him that will not be guilty of stupidity.
Is it reasonable that even the arts should take advantage of and profit by our natural stupidity and feebleness of mind?
To say less of yourself than is true is stupidity, not modesty. To pay yourself less than you are worth is cowardice and pusillanimity.
In truth, knowledge is a great and very useful quality; those who despise it give evidence enough of their stupidity. Yet I do not set its value at that extreme measure that some attribute to it.
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