学习
3 你今日当知道,耶和华─你的神在你前面过去,如同烈火,要灭绝他们,将他们制伏在你面前。这样,你就要照耶和华所说的赶出他们,使他们速速灭亡。
'To grind' is to collect and learn the things that are serviceable to faith.
(参考: Apocalypse Explained 163)