"all that you can't leave behind"

it's taken from U2's walk on. it makes sense, in a way. but i don't think people could ever let go. not really.
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you've got to leave it behind

all that you fashion
all that you make
all that you build
all that you break
all that you measure
all that you feel
all that you can't leave behind
all that you reason
all that you care
it's only time
all that you feel
all that you find
all all that you sense
all that you speak
all you dress up
all that you scheme