Frank asked me the same (in a pm) this morning & I think it's ok. Lilian. It's a daily used phrase.
According to Wikiquote:
*Translation: "Reflect on beforehand."
*Notes: Meaning "think through the consequences before you act". The proverb is also somewhat of a word game, since the Swedish expression for "reflect" litterally is made up of the words "think after" and "on beforehand" litterally is "before", rendering the sentence "think after before".