The Art of War by active 6th century B.C. Sunzi

11. What the ancients called a clever fighter is one who not only wins,

but excels in winning with ease. [The last half is literally "one who, conquering, excels in easy conquering." Mei Yao-ch’en says: "He who only sees the obvious, wins his battles with difficulty; he who looks below the surface of things, wins with ease."]