let the cobbler stick to his last

used to suggest that individuals should focus on their area of expertise or specialization, rather than attempting to do things they are not skilled at, to avoid the risk of failure

The origin of the proverb "let the cobbler stick to his last" can be traced back to ancient Greece, where the idea was expressed by various philosophers and thinkers. The saying implies that individuals should stick to their area of expertise and not try to take on tasks outside their skills, as doing so may lead to mistakes or failure. It serves as a reminder to value specialization and avoid overextending oneself in unfamiliar areas.