Whether a piece of wood can be used, how to use it, and what to give up is not said with mouth, say with eyes, nor is it inferred from old experience-there is only one authority, that is, to measure it with a ruler and to correct it with ink thread. This is the carpenter's rule. Craftsmen are respected because they are meticulous in their work and always follow the rule that rulers have the most say.
passage?
As a yardstick and yardstick, rules provide an objective standard for people to do things