The meaning of "knowing" has shifted from being able to remember and repeat information to being able to find and use it.
如果一件事情自己都没有搞明白,又怎么能去教导别人,让别人明白呢?
当1988年波克夏股票在纽约证券交易所挂牌上市时,巴菲特半开玩笑地对经纪商说
I don’t think I’ll ever stop writing love songs.