To paraphrase 18th-century statesman Edmund Burke,“All that

为了解释18世纪政治家爱蒙德·伯克的话,“被误导的运动要想成功,所需的只是好人不作为.”
All that is needed for the triumph of a misguided cause is that good people do nothing.
= All that is needed is that good people do nothing.
- All that is needed for the triumph
- the triumph of a misguided cause

To paraphrase 放在句首意思是让你用英语改述下面这句话。
整句话意思是：一个被误导的事业如果要成功，它惟一需要的是好人无所作为。

To paraphrase 放在句子前面的作用主要就是为了引出后面的引述内容，通俗一点，意思就是“换句话说，坏人要想做成坏事只需要好人对他们的所作所为无动于衷。