I love Piet Hein's grooks, as I have mentioned. This one gives me pause for thought, as do most of them.
GROOK ON LONG-WINDED AUTHORS
Long-winded writers I abhor,
and glib, prolific chatters;
give me the ones who tear and gaw
their hair and pens to tatters:
who find their writing such a chore
they only write what matters.