I have to credit this post to a book that I read a long time ago called Supercoach by Michael Neill. He is just about to re release this book (ten years on).
The interesting thing is that although I read the tip/formula when he first published the book I did not really get it. However, on recently coming across it again, it just made perfect sense.
The tip is all about how much you are emotionally invested in an outcome compared to how involved you are in making it happen.
If you are highly invested yet have a low involvement, you are a bit like a raving football fan in that you will be really pleased to achieve and gutted to fail, yet your involvement (in the case of the football fan - its the waving, jeering and cheering) is not going to have much impact on whether the result is achieved. Generally this is not a good combination as your emotions will be taken for a rollercoaster ride.
On the other hand, if you are highly emotionally invested and have a high involvement (like most business owners), you may still be on the rollercoaster ride (emotionally) but you will have a reasonable amount of influence in creating the result.
As a key person in a business, increasing your level of detachment to the result (i.e becoming less emotionally invested in whether the outcome is successful) and more involved in making things happen (either or both physically and/or mentally) will cost you less energy and create a better result.