He forgot once every day, and Zhu Wen reminded him once every day, and what he was indeed learning was just morality and rites. Zhu Wen carefully monitored his progress in reading, and explained the classics with extensive references.
Pei Ye had never studied the classics so thoroughly before. It wasn't the superficial touch of his early years, nor the passive learning at the National University. Zhu Wen's teaching was as serious as his personality, and even though they had agreed to study together for only a month, he still spent an entire afternoon with the young man consulting nearly twenty books—just to confirm in the end that there indeed was no fixed interpretation of a certain character.