Mary's mouth cost her nothing for she never opens it but at others' expense.
Those who in quarrels interpose, must often wipe a bloody nose.
Gain may be temporary and uncertain; but ever while you live, expense is constant and certain: and it is easier to build two chimneys than to keep one in fuel.
He that lieth down with Dogs, shall rise up with Fleas.
He that goes a borrowing goes a sorrowing.
A fat kitchin, a lean Will.