Time travel is the most frustrating thing in the world. You can't change anything, and you can't stop anything from happening.
【译文】 楚国的狂人接舆唱歌路过孔子车旁,说:“凤啊!凤啊!你怎么这样倒霉?过去的不可挽回,未来的还可以赶上。算了!算了!现在的执政者很危险!”
The hardest thing to explain is the glaringly evident which everybody had decided not to see.