The mystics have two processes in dealing with these lines. One process is to renew this line by putting in some other color and therefore changing one impression into another impression. No doubt this needs great knowledge of mental chemistry. Another way that the mystic takes is to rub out the line from the surface. But often, when the line is deep, it takes the rubbing out of a great portion of the mind to destroy one line. Naturally the mystic becomes tolerant of every sort of dealing of others with him, as he sees not only the dealing as it appears, thoughtful or thoughtless, cold or warm, but the cause which is at the back of it.