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.

解释：善于制造弓箭的工匠之子，必须先从编织簸箕开始；善于冶炼的工匠之子，必须从连缀皮裘开始。

The best designs come from understanding the problem deeply and then finding the simplest solution.

一切皆有可能。不要给自己设限。