The study of mental processes requires both experimental and comparative methods.
The wisdom of hindsight, so useful to historians and indeed to authors of memoirs, is sadly denied to practising politicians.
出自汉·桓宽《盐铁论·击之》。释义：做事中途停止就不会成功，种地偷懒的人不会有收获。比喻学习应持之以恒，不能懈怠。
"I guess that’s just part of loving people: You have to give things up. Sometimes you even have to give them up."