Ne è quovis Ligno Mercurius fiat.

A statue of Mercury may not be made from every kind of wood. All dispositions and capacities are not adapted to the higher walks of literature. It is incumbent on parents to educate their children, but they should give them such instruction, as is suited to their talents. Artificers are careful to make choice of materials fit for the work they have in hand, whether metal, stone, or wood; using the coarser sort for rough and common articles, the, finer for those that require to be more exquisitely finished. "You cannot make," we say, "a silken purse of a sow's ear," or "a horn of a pig's tail," or "a good coat", "of coarse or bad wool." The Spaniards say, "De ruyn paño nunca buen sayo".