That "feeld hath eyen and the wode hath eres."
– Geoffrey Chaucer
The Canterbury Tales, The Knight’s Tale. Here the Knight quotes an old saying that the field has eyes and the wood ears. He says this just as Palamon, who has escaped from his prison tower and fled to a grove, is about to discover the disguised Arcite in the grove. The Knight is the consummate professional soldier who knows to never let his guard down in a dangerous and unpredictable world.