这个句子的意思是“它向我们所有人显现(显示)了出来”,menifest itself 可以看成一种习惯用法…
manifest本身就可以做形容词“显而易见的”,The bad result was manifest due to his terrible speech.
manifest还有“显示、表现”的意思,He manifested an interest in English.=He manifested that he was interested in English.
manifest还可以做名词,旅客名单,货物清单