If you're lugging a heavy bag,
don't fail to look inside it
to see whether what is inside is bitter or sweet.
If it's really worth bringing along, bring it;
otherwise, empty your sack
and redeem yourself from fruitless effort and disgrace.
Only put into your sack
that which is worth bringing to a righteous sovereign.
... Mathnawi IV: 1574-1577, Mevlana Rumi