This means that systems, methods, and practices that were once extremely successful may no longer achieve the same kind of success today.
這就是說，多年前非常成功的政治或經濟制度、方法和活動，未必能在今天的社會，用同樣的觀念和做法，獲得同樣的成功。所以，經營現代的政治、經濟、教育等社會，必須以今日的觀念和做法，才能達到事半功倍的效果。