"About this fourth definition in Ethics, Master, you said that it is practically found in all our daily conversations [15. I don't understand."
"Is that not obvious enough? When we say: 'imagine ...', or 'You would not believe it ...', and 'You can see how I liked THAT...', and so forth, is it not all like putting your shoes on his feet, or, putting his shoes on yours? It is basic for communication that you do NOT make the sounds that you find would represent the ideas, but you make the sounds you know the others would make should they want to induce the idea in you. It is basic for a traffic rule that you do not stop for a red light because it is red, but because you know that for the crosstraffic the light is green, therefore driving on for you is dangerous. Does not say Epictetus 'Do I choose to write the name of Dion as I will? No; but I am taught to be willing to write it as it ought to be writ'. (Disc. 12.1.) So is passing a red light not dangerous by itself, you do it often enough without harm, even neon signs and those in shop-windows. This is why Man, the other, as measure for your own conduct, our fourth rule, is fundamental for living together, hence, to be found in everyday conversations." [15]