愚者自以为聪明，智者则有自知之明

“The fool doth think he is wise, but the wise man knows himself to be a fool.”
― William Shakespeare, As You Like It

愚者自以为聪明，智者则有自知之明。
——威廉·莎士比亚，《皆大欢喜》（ As You Like It ）

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智慧人面对一些事情会采取适合实际需要的灵活办法应对；愚蠢的人固执己见、自以为是，听不进一点儿别人的意见。