不入虎穴，不得虎子

Explanation: Not enter the Tiger Cave, you can not catch a small tiger. Parable results could not be achieved without risk. 　　Source: Southern Song Fan Ye, "Biography of the Later Han Ban Chao": "Super said: 'Nothing ventured, no nothing. Today's measure, unique to Fire Attack prisoner by night, so he did not know how much I shall earthquake terror can exterminate do too '. "