The hardest thing to explain is the glaringly evident which everybody had decided not to see.
解析:经常反省检查自己,不给私欲留空间。
In the long history of humankind (and animal kind, too) those who learned to collaborate and improvise most effectively have prevailed.
子夏说:“每天都学到些新东西,每月都不忘所学会的东西,就算好学了。”
The world is full of obvious things which nobody by any chance ever observes.