耳聽為虛,眼見為實 [ㄦˇ ㄊㄧㄥ ㄨㄟˊ ㄒㄩ , ㄧㄢˇ ㄐㄧㄢˋ ㄨㄟˊ ㄕˊ; er3 ting1 wei2 xu1 , yan3 jian4 wei2 shi2]
Take what you hear to be false, only believe it when you see it (idiom). Don't believe what people tell you until you see if for yourself.
It ain't necessarily so.
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