The fundamental qualities for good execution of a plan is first; intelligence; then discernment and judgment, which enable one to recognize the best method as to attain it; the singleness of purpose; and, lastly, . . . stubborn will.
Source: In Poor Man's College Quotations Collection, ed. Sidney Madwed, AAPEX software, 1994.
-- Ferdinand Foch, (Oct 2 1851-1929), French field marshal; He was supreme commander of Allied forces, 1918; directed final victorious offensive, WW I.