collaborate from within with forces from outside
如果没有强大的内心与之里应外合，就会被外在所控制。
But if our inner-self is not strong enough to interact with the outer means, we will lose control of ourselves.
youdao
里应外合，汉语成语，拼音是lǐ yìng wài hé，指的是外面攻打，里面接应，出自元·杨梓《博让理德》。
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