《资治通鉴·梁纪·梁纪三》
古代的祀祭天地，礼仪有常规，诚敬之道，至此而完备，至于封禅，实在是不敢妄说。 
古者祀天祭地，礼有常数，诚敬之道，尽此而备。至于封禅，非所敢闻。 
In ancient times, sacrifices to heaven and earth had regular etiquette. The way of sincerity and respect is complete at this point, as for the sealing Zen, I really dare not say it.