And, to conclude, he that leaveth nothing to Chance will do few things ill, but he will do very few things.

George Savile, Marquis of Halifax (1633-1695) English politician and essayist

“Of Caution and Suspicion,” Political, Moral, and Miscellaneous Thoughts and Reflections (1750)
    (Source)

Sometimes incorrectly attributed to Edward Wood, Earl of Halifax (1881-1959).