You forget your feet when the shoes are comfortable. You forget your waist when the belt is comfortable. Understanding forgets right and wrong when t… - Zhuangzi

A fish-trap is for catching fish; once you've caught the fish, you can forget about the trap. A rabbit-snare is for catching rabbits; once you've caught the rabbit, you can forget about the snare. Words are for catching ideas; once you've caught the idea, you can forget about the words. Where can I find a person who knows how to forget about words so that I can have a few words with them?

Duke Huan was in his hall reading a book. The wheelwright P’ien, who was in the yard below chiselling a wheel, laid down his mallet and chisel, stepped up into the hall, and said to Duke Huan, ‘This book Your Grace is reading—may I venture to ask whose words are in it?’ ‘The words of the sages,’ said the duke. ‘Are the sages still alive?’ ‘Dead long ago,’ said the duke. ‘In that case, what you are reading there is nothing but the chaff and dregs of the men of old!’ ‘Since when does a wheelwright have permission to comment on the books I read?’ said Duke Huan. ‘If you have some explanation, well and good. If not, it’s your life!’ Wheelwright P’ien said, ‘I look at it from the point of view of my own work. When I chisel a wheel, if the blows of the mallet are too gentle, the chisel slides and won’t take hold. But if they’re too hard, it bites in and won’t budge. Not too gentle, not too hard—you can get it in your hand and feel it in your mind. You can’t put it into words, and yet there’s a knack to it somehow. I can’t teach it to my son, and he can’t learn it from me. So I’ve gone along for seventy years and at my age I’m still chiselling wheels. When the men of old died, they took with them the things that couldn’t be handed down. So what you are reading there must be nothing but the chaff and dregs of the men of old.’

Right is not right; so is not so. If right were really right it would differ so clearly from not right that there would be no need for argument. If so were really so, it would differ so clearly from not so that there would be no need for argument.