Ecclesiastes 10:9-10

⁹He that beareth over stones, shall be tormented in those; and he that cutteth trees, shall be wounded of those. (He who carrieth stones, can be hurt by them; and he who cutteth wood, can be injured when cutting it.)

¹⁰If iron is folded again, and it is not as before, but is made blunt, it shall be made sharp with much travail; and wisdom shall follow after busyness.