WIST

Men have made an idol of luck as an excuse for their own thoughtlessness. Luck seldom measures swords with wisdom. Most things in life quick wit and sharp vision can set right.

Democritus (c. 460 BC - c. 370 BC) Greek philosopher
Frag. 119 (Diels) [tr. Bakewell (1907)]
    (Source)

Bakewell lists this under "The Golden Sayings of Democritus." Freeman notes this as one of the Gnômae, from a collection called "Maxims of Democratês," but because Stobaeus quotes many of these as "Maxims of Democritus," they are generally attributed to the latter. Alternate translations:

• "Men have fashioned an image of Chance as an excuse for their own stupidity. For Chance rarely conflicts with intelligence, and most things in life can be set in order by an intelligent sharpsightedness." [tr. Freeman (1948)]
• "Men fashioned the image of chance as an excuse for their own thoughtlessness; for chance rarely fights with wisdom, and a man of intelligence will, by foresight, set straight most things in his life." [tr. Barnes (1987)]