Respuesta :

thegirlwithbooks
It means that nobody knows what they would do if they were another person for a day until they became that person
mgeylonger
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First part ~ 'No man could tell what he would do if he were in the shoes of another man' ~ 
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This is known as empathy, He will never get a chance to know how another person will/would feel in situations/life.
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Hoped this worked! 
                                 ~ MgeyLonger