《淮南子·道应训》
所以这位工匠是把所有的精力都用到捶制钩上来，这样也就能长期管用，何况又把握了无论什么都管用的道，那么什么事情不能从 道 那里得到帮助？所以《老子》说： 从事于 道 的，便同于 道 。 
是以用之者必假于弗用也，而以长得其用，而况持无不用者乎，物孰不济焉？故老子曰： 从事于道者，同于道。 
So this craftsman devoted his full energy to forging the hook, so that it could be used for a long time. Moreover, he had grasped the Dao that could be used for everything, so what couldn't be helped by Dao? Therefore, the Laozi says: Those who engage in Dao are the same as Dao.