One sin lived in and indulged

(Thomas Brooks, "Touchstone of Sincerity")

Satan knows that one sin lived in and indulged,
will as certainly damn a man as many sins; as one
disease, one ulcerous part, may as certainly kill a
man as many diseases.

O sirs! remember that as one hole in a ship will sink
it; and as one stab at the heart will kill a man; and
as one glass of poison will poison a man--so one sin
lived in and indulged will damn a man forever.

One wound strikes Goliath dead, as well as 23 did
Caesar; one Delilah will do Samson as much mischief
as all the Philistines; one vein's bleeding will let out
all the vitals; one bitter herb will spoil all the pottage.

One Achan was a trouble to all Israel; one Jonah was
too heavy for a whole ship; so one sin lived in and
indulged, is enough to make a man miserable forever.

One millstone will sink a man to the bottom of the
sea as well as a hundred; so one sin lived in and
indulged will sink a man to the bottom of hell as
well as a hundred.