This could have been Lao Tzu's last poem ( 600 BCE)

Be empty as space
be rooted in nothing
be invisible like the drifting wind
be the sage in no-knowing-

be not trapped ever
in self-absorbing
be not fazed by any happening
gain understanding without thinking-

they wrongly regard that happiness
depends on achieving
this is ephemeral like everything
the final outcome would be frustrating --

clenched hands --how they hurt!
Closed hearts -- how deep is the bleeding!
so few mortals such as we are
know the power and blessing of forgetting!