不入虎穴，焉得虎子
bù rù hǔ xué , yān dé hǔ zǐ
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1 How do you catch the tiger cub without entering the tiger's lair? (idiom); Nothing ventured, nothing gained.
千里之堤，溃于蚁穴
qiān lǐ zhī dī , kuì yú yǐ xué
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1 an ant hole may cause the collapse of a great dike (idiom)
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2 huge damage may result from a moment's negligence
空穴来风
kōng xué lái fēng
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1 lit. wind from an empty cave (idiom)
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2 fig. unfounded (story)
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3 baseless (claim)
空穴来风未必无因
kòng xué lái fēng wèi bì wú yīn
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1 wind does not come from an empty cave without reason
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2 there's no smoke without fire (idiom)