《明史·列传·卷一百七十六》
维桢考虑自己年衰，于五年正月极力奏请辞官归家。
维桢亦以年衰，明年正月力乞骸骨去。
Weizhen considered himself to be old and weak, and in January of the fifth year, he strongly requested to resign from his official position and return home.