What does "it took the heart of a Child to reach the soul of the world" mean?

I read it in a card...but couldnt exactly figure out the meaning. Thank you for your help! or:I read it in a card...but couldn't exactly figure out th

I read it in a card...but couldn't exactly figure out the meaning. Thank you for your help!

or:I read it in a card...but couldn't exactly figure out the meaning. Thank you for your help!

or:as a childs soul is pure & free of sins his soul would be taken by someone

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