A quote by Tim Ferris. First I disagreed as it was so much out of my world view strongly but it stayed in the back of my head. Then it changed my world view and me.

Things are not good or bad, but constructive or not and the constructiveness of tasks follows a Power Law. When I am just busy, I do a lot of things too fast without ever reflecting on their constructiveness. I have a very short-sighted view. But the power law states, that there is only a handful things to do, that are important. I is hard to reflect and also it is hart to NOT do things (Focus means doing doing things you want). Not working on the most important tasks is easier, and not thinking about this problem by being busy is lazy!