Old age is not interesting until one gets there.

A person may cause evil to others not only by his actions but by his inaction， and in either case， he is justly accountable to them for the injury.

发现的道路很少是一条直线。

天下只有具体的事物（器）存在。所谓规律（道）是事物的规律，不能将事物说成是规律的事物。