Money is the root of all evil.
Murder will out.
Never [Don't] look a gift horse in the mouth.
Never [Don't] put off till tomorrow what you can do today.
Never speak ill of the dead.
Nothing succeeds like success.
Offense is the best defense.
Old habits die hard.
One of these days is none of these days.
One swallow does not make a summer.
Opportunity never knocks twice at any man's door.
Pity is akin to love.