《明史·列传·卷一百八十一》
振之曾写一小简，藏于一个小书箱内，每年元旦必取出来看，看后又放在书箱并加上封条。
初，振之书一小简，藏箧中，每岁元旦取视，辄加纸封其上。
Zhenzhi once wrote a short letter, which he hid in a small bookcase. He would take it out to read every New Year's Day, then put it back in the bookcase and seal it up again.