There are some things that you should quit. When you find the costs outweigh the benefits, you should cut your losses. If you are in a dying business, you need to re-evaluate your situation. For example, when my company sent out a letter that stated over the last 8 years, they had experienced a 8-10% loss in market each year, and they brought in a company known for liquidation, I knew I needed to be ahead of the closure. Technology had made their product obsolete, but instead of developing new products, the simply rode out the product life cycle.

There are benefits to dabbling too. The more varied activities, to which you expose your brain, the more connections it develops. Common sense is taking experience and applying it. The more experiences you have, the more applications you can find.

Being singular in focus, means you can excel in one thing. Being a Jack of All trades, means you are already cross trained. We need both kinds of people, but neither works out successfully in the wrong environment. A diverse person will feel stifled in a highly structured, large corporation, with highly defined, narrow focused job descriptions, and a highly focused specialist will be totally inept in an entrepreneurial start up.

Thanks Harrison!