《资治通鉴·汉纪·汉纪三十五》
富平侯张纯，是张安世的四世孙，曾经历王莽时代，因敦厚谨慎守法而能保全爵位。建武初年，张纯先来归附，照旧为侯。
富平侯张纯，安世之四世孙也，历王莽世，以孰谨守约保全前封；建武初，先来诣阙，为侯如故。
Marquis of Fuping Zhang Chun is the fourth generation grandson of Zhang Anshi. He experienced Wang Mang dynasty and kept his titles because of being honest, careful and abiding by laws. In the first year of Jianwu period, Zhang Chun returned to Han Dynasty first and kept as Marquis.
<s>[INST] Kindly elucidate the central themes in this passage in English: 富平侯张纯，安世之四世孙也，历王莽世，以孰谨守约保全前封；建武初，先来诣阙，为侯如故。 [/INST] Marquis of Fuping Zhang Chun is the fourth generation grandson of Zhang Anshi. He experienced Wang Mang dynasty and kept his titles because of being honest, careful and abiding by laws. In the first year of Jianwu period, Zhang Chun returned to Han Dynasty first and kept as Marquis.</s>
Kindly elucidate the central themes in this passage in English: 富平侯张纯，安世之四世孙也，历王莽世，以孰谨守约保全前封；建武初，先来诣阙，为侯如故。
user
Marquis of Fuping Zhang Chun is the fourth generation grandson of Zhang Anshi. He experienced Wang Mang dynasty and kept his titles because of being honest, careful and abiding by laws. In the first year of Jianwu period, Zhang Chun returned to Han Dynasty first and kept as Marquis.
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