Bad fruit of knowledge, if this be to know;
Which leaves us naked thus, of honour void
Of innocence, of faith, of purity
Our wonted ornaments now soiled and stained
And in our faces evident the signs
Of foul concupiscence

from John Milton – Paradise Lost, Book 8 on Rap Genius

Meaning

This “knowledge” thing doesn’t seem so great to Adam; it makes him feel dirty for being literally and figuratively naked (stripped of innocence) and for having had freaky sex with Eve

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