There is no substitute for sound judgement in business

"for the want of a nail the shoe was lost,
for the want of a shoe the horse was lost
and for the want of a horse the rider was lost,
being overtaken and slain by the enemy,
all for the want of a horse-shoe nail.

Published in Poor Richard's Almanac in 1758 by Benjamin Franklin.

One of the keys to business success is to develop the ability to identify the nail.