A bystander is always clear-minded.;A bystander sees through everything.;A disinterested person sees the thing more clearly than the people whose interests are bound up with it.;A neutral third party sees the issue in question more clearly than the disputants. ;

Generally , for matters under heaven, those closely involved cannot see as clearly as those outside.
大凡天下事, 当局者迷, 旁观者清.
来源:《现代汉英综合大词典》
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