This is the story of a custom in the cram school (what is called juku in Japanese) I worked for several years ago. In the school, when winter was approaching, every teacher was supposed to write a short message for students who were going to take the entrance examination. The messages were displayed along the corridor so that they could read them as they passed by. Every English teacher tried to think of some quotes or proverbs in English that the students would find motivating and inspiring. A teacher wrote, "No pain, no gain." Another wrote, "Where there is a will, there is a way." Still another wrote, "Don't count the days. Make the day count."
There was a teacher of English I didn't trust or like. He was the leader of English teachers, but he was lacking in personality. He was arrogant, and always seemed reluctant to help other teachers, which was definitely on his job description. So, I wanted to know what such a person had written for the students. He wrote, "Light gains make heavy purses." At first, it didn't make any sense to me. I saw nothing inspiring in it. "Gee, I don't want to carry a heavy purse." This is what I thought when I first saw it. But after googling it, it turned out to be a proverb. It means that if you make progress gradually but constantly, it will get you far. Now it all made sense. He was a teacher of English after all.
I will let you know what I wrote then in case there is anyone who wants to know. Twisted as I was, I wrote "Don't waste your time on such trifles. Go spend your time studying already." Maybe it was me that was lacking in personality.