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谚语, 成语 and 歇后语

One never comes to pray in the Temple of Three Treasures if he is not in trouble.
无事不登三宝殿 (Wú shì bū dēng sānbǎodiàn)

Things will develop in the opposite direction when they become extreme.
物极必反 (Wù jí bì fǎn)

No wind, no waves.
无风不起浪 (Wú fēng bù qǐ làng)

Ruthlessness is key to a man’s accomplishment.
无毒不丈夫 (Wú dú bù zhàngfu)