"If one is not extremely careful, Somebody may come up from behind and strike him. Misfortune."
The Yi says: Watch your back! The main message and changing lines are all about not overextending yourself in this time of Progress. Line 3 says: Self-confidence is dangerous if it blinds you to reality. As Henry Kissinger famously said, "Even paranoids have real enemies." There are external sources that are indeed hostile to you and your plans. Be alert and be prepared. (Daily Yi)