《史记·七十列传·龟策列传》
褚先生说：我通晓经术，做博士弟子，研究《春秋》，由于成绩优秀被任命为郎官，有幸能在宫中值宿警卫，出入宫殿中十多年。
褚先生曰：臣以通经术，受业博士，治春秋，以高第为郎，幸得宿，出入宫殿中十有馀年。
Mr. Chu said: I am familiar with classics, as a disciple of a doctor, and studied “Spring and Autumn”. Because of my excellent grades, I was appointed as a Langguan official and had the honor to stay in the palace for more than ten years.