기둥을 치면 들보가 울린다
post-OBJ hit-WHEN crossbeam-SUBJ ring-PRES
When you hit the post, the crossbeam rings.
This refers to the post and crossbeam of an old-style house (한옥 = traditional “Korean house”). I visualize that by hitting the post you could get a sort of tone from the crossbeam, in a well-constructed house. It seems to mean that you can achieve a better result by going at something indirectly. Don’t tackle problems head-on.
I would do well to take this advice.
