《明史·列传·卷一百九十二》
太子年方九岁，覃吉向他口授《四书》章句以及古今政典。
太子年九岁，吉口授《四书》章句及古今政典。
The crown prince was only nine, Tan Ji orally taught him the chapter phrases of the "four books" and the ancient and modern political doctrines.