《宋书·列传·卷八十二》
三年为父母守孝，是古今通用的制度。因为悲哀是真诚发生的，所以制定外在的规矩，时间一久便成习惯，所以规定很长时间而习惯礼制。
又三年之丧，天下之达丧，以其哀并衷出，故制同外兴；日久均痛，故愈迟齐典。
The three-year mourning period for parents is a system prevalent in both ancient and modern times. Because the sadness is genuine, an external guideline is set. After a long time, it becomes a habit, so a long period of time is set to abide by the rites and customs.
<s>[INST] Take each pair of old and new sentences and unite them into a single translation that captures the core meaning: Archaic: 又三年之丧，天下之达丧，以其哀并衷出，故制同外兴；日久均痛，故愈迟齐典。 Updated: 三年为父母守孝，是古今通用的制度。因为悲哀是真诚发生的，所以制定外在的规矩，时间一久便成习惯，所以规定很长时间而习惯礼制。 [/INST] The three-year mourning period for parents is a system prevalent in both ancient and modern times. Because the sadness is genuine, an external guideline is set. After a long time, it becomes a habit, so a long period of time is set to abide by the rites and customs.</s>
Take each pair of old and new sentences and unite them into a single translation that captures the core meaning: Archaic: 又三年之丧，天下之达丧，以其哀并衷出，故制同外兴；日久均痛，故愈迟齐典。 Updated: 三年为父母守孝，是古今通用的制度。因为悲哀是真诚发生的，所以制定外在的规矩，时间一久便成习惯，所以规定很长时间而习惯礼制。
user
The three-year mourning period for parents is a system prevalent in both ancient and modern times. Because the sadness is genuine, an external guideline is set. After a long time, it becomes a habit, so a long period of time is set to abide by the rites and customs.
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