The sun, with all those planets revolving around it and dependent on it, can still ripen a bunch of grapes as if it had nothing else in the universe to do.

解释：遵守礼制，可使国家长久，使社稷安定，让人们尊卑有别，上下有序，对后代是有益处的。

只有向后看才能理解生活；但要生活好，则必须向前看。

Only by continuous learning can we make continuous progress.