The defense minister of the state of Chu noticed that one of his subordinates(下级), an eighty-year old blacksmith, and still maintained masterly craft despite of his old age.

　　He inquired of the old man about the reason.

The old man replied, "It is because I abide by the rules.

I have liked forging waistband hooks ever since I was twenty.

I have been concerned about nothing but waistband hooks, and never looked carefully at things other than hooks.

By doing so, I have had a lot of time and energy to master what I wanted to master.

Once I reach this realm, all things come into my usage.

"　　楚国的大司马见属下的铁匠虽然年已八十，但记忆仍然精湛，便询问其中的原因。

　　老人回答说：我遵守行为的法则呀。

我二十多岁的时候，就喜欢锻打腰带钩，对于别的什么，都不关心;不是腰带钩，我从不仔细去看。

这样，我就有了足够多的时间和精力，去熟练掌握想要掌握的东西。

一旦达到这种境界，万物都会为我所用!

”【锤钩者查看网站：[db:时间]】